Executive Overview
For decades, the running community has been dominated by a singular preoccupation: cardiovascular capacity. Runners obsess over weekly mileage counts, cadence targets, VO2 max scores, and the relentless pursuit of race-pace optimization. Yet, far too many athletes treat strength and conditioning as an afterthought, often cramming haphazard stretching routines or generic abdominal crunches into their schedules. According to elite endurance coaches and physical therapists, this oversight is the primary culprit behind chronic running injuries, plateaued performance, and premature fatigue.
Enter the core. Far from being merely an aesthetic muscle group responsible for a toned midsection, a robust and functionally integrated core is a runner’s ultimate secret weapon. It serves as the stabilizing anchor that absorbs the relentless, repetitive impact of every single stride, preserves an efficient upright posture, and maximizes energy transfer from the upper body down to the ground.
To bridge the gap between traditional cardio-heavy training and holistic biomechanical health, Sam Tomlinson—a seasoned personal trainer, accomplished ultramarathon runner, and ambassador for the global running platform Realbuzz—has formulated a targeted, five-move core workout. Designed explicitly for runners, this routine shifts the focus away from vanity muscles and toward the deep structural stabilizers that govern human locomotion. By integrating this targeted circuit into a weekly training regimen, runners of all tiers can unlock unprecedented levels of stability, endurance, and running economy.
Detailed Chronology: The Evolution of Runner-Specific Conditioning
The paradigm of distance running has undergone a quiet revolution over the past fifteen years. Historically, runners were warned against traditional strength training out of fear that building muscle mass would weigh them down or impair aerobic efficiency. The conventional wisdom was simple: to get better at running, you simply needed to run more.
However, as sports science evolved and biomechanical analysis became more sophisticated, researchers began to understand the severe physical toll of high-volume running. Running is not a continuous, fluid motion; rather, biomechanically speaking, it is a rapid succession of single-leg landings. Every time a runner’s foot strikes the asphalt or trail, their body must absorb forces equivalent to roughly three to four times their total body weight.
Recognizing this high-impact reality, forward-thinking trainers like Tomlinson began pioneering integrated conditioning programs. In 2014, Tomlinson completed his professional certifications with Health and Fitness Education (HFE) in the UK, setting the stage for a coaching philosophy grounded in functional movement. Two years later, alongside his brother and fellow fitness professional Joe, he co-founded PRIME Personal Training in Rawtenstall, England.
Through years of working face-to-face with endurance athletes, Tomlinson observed a recurring pattern: runners who suffered from nagging lower back pain, persistent runner’s knee, or hip tightness almost universally displayed profound weaknesses in their lateral stability and deep trunk musculature. This firsthand coaching experience, combined with his own grueling athletic pursuits—culminating in harrowing endurance feats such as completing the 100-kilometer Ultra-Trail Snowdonia with 6,500 meters of elevation gain in a relentless 26 hours—solidified his conviction. Core training could no longer be treated as an optional accessory; it had to become a foundational pillar of endurance preparation.
Supporting Context & Metrics: The Anatomy of a Runner’s Core
To truly appreciate why Tomlinson insists that his clients perform his signature five-move circuit, one must expand the definition of the "core." Traditional fitness culture often narrows this down to the rectus abdominis—the superficial "six-pack" muscles. For a runner, however, relying solely on abdominal crunches is wholly inadequate.
The True Architecture of Stability
A runner’s core is a complex, three-dimensional cylinder of muscle that encompasses:
- The Glutes and Hips: Powerhouses of propulsion and lateral pelvic control.
- The Lower Back (Erector Spinae): Guardians of spinal extension and posture during the latter miles of a race when fatigue sets in.
- The Transverse Abdominis: The deepest layer of abdominal tissue, acting like a natural corset to compress the internal organs and stabilize the spine.
- The Obliques: Internal and external side-body stabilizers that prevent undesirable rotational torque with every stride.
“Core training for runners is not just about strengthening the abdominal muscles,” Tomlinson explains in an interview with Fit&Well. Instead, he emphasizes that runners must build functional fortitude across the glutes, hips, lower back, and deeper trunk muscles. These disparate groups must operate in flawless synchronicity to keep the pelvis and spine stable under extreme duress.
The Physics of the Footstrike
Consider the biomechanics of a standard running stride. When a runner pushes off the ground, their pelvis is suspended momentarily in space before crashing down onto a single supporting leg. If the stabilizing muscles surrounding the side of the trunk and hips—such as the gluteus medius and the obliques—are fatigued or underdeveloped, the pelvis will inevitably drop or rotate improperly upon impact.
This phenomenon, known clinically as contralateral pelvic drop (or a Trendelenburg gait), sets off a destructive kinetic chain. A dropping pelvis forces the femur to internally rotate, which in turn stresses the knee joint, strains the IT band, and transfers excessive torsion up into the lumbar spine. By introducing targeted isometric and dynamic stability exercises, runners can effectively bulletproof their bodies against these mechanical inefficiencies.
Official Guidelines: Tomlinson’s Five-Move Core Circuit
Tomlinson recommends executing this comprehensive circuit once or twice a week, ideally performed immediately following an easy, low-intensity recovery run. This timing ensures that the central nervous system is primed, but that the runner’s primary energy stores have not been depleted by an intense speed session or long-distance tempo run.
The routine follows a strict sequential order. Practitioners should rest approximately 10 seconds between individual movements to allow for transition, and take a full one-minute rest between complete rounds. Athletes should aim to complete three full rounds, utilizing Tomlinson’s curated regressions or progressions to match their precise current fitness capabilities.
1. The Hollow Hold
- Time: 20–40 seconds | Rest: 10 seconds
- Execution: Lie flat on your back on a comfortable exercise mat. Press your lower back firmly into the floor—this pelvic tilt is non-negotiable. Engage your core, lift your shoulder blades slightly off the ground, and extend your arms forward. Simultaneously, lift your straight legs a few inches off the floor until your body forms a shallow, banana-like "hollow" shape.
- Make it easier: Bend your knees toward your chest to shorten the lever and drastically reduce the mechanical pressure exerted on your lower back.
- Make it harder: Extend your arms straight overhead past your ears and lower your straight legs closer to the floor, intensifying the load on your deep abdominals.
2. The Side Plank
- Time: 20–30 seconds per side | Rest: 10 seconds
- Execution: Lie on your right side with your forearm positioned directly beneath your shoulder. Stack your left foot directly on top of your right foot (or stagger them slightly for a wider base of support). Lift your hips until your body forms a clean, straight diagonal line from your ankles to your shoulders, engaging your obliques and lateral hip stabilizers. Repeat on the opposite side.
- Make it easier: Drop your bottom knee to the floor while keeping your hips elevated, which reduces the immediate strain on your core and shoulder girdle.
- Make it harder: Lift and hold your top leg away from your bottom leg, creating an open-scissor position that severely challenges lateral stability.
3. The Plank Hip Roll (Hip Dips)
- Reps: 10 repetitions per side | Rest: 10 seconds
- Execution: Assume a standard forearm plank position with your elbows tucked beneath your shoulders and your core braced. Keeping your upper body stable and your forearms planted firmly, slowly roll your hips to the right, dipping them until they hover just above the floor. Return to center, then seamlessly roll your hips to the left, repeating in a controlled, rhythmic oscillation.
- Make it easier: Lower your knees to the floor while maintaining a modified plank position, keeping your hips low and focused.
- Make it harder: Slow the movement down drastically, pausing for a full two-second isometric hold just above the floor on each side to maximize time under tension.
4. The Bear Plank Shoulder Tap
- Reps: 8 repetitions per side | Rest: 10 seconds
- Execution: Start on your hands and knees in a quadruped position. Tuck your toes, engage your core, and hover your knees just one inch off the floor, keeping your back flat. Without shifting your hips or allowing your torso to rotate, lift your right hand off the floor and tap your left shoulder. Place your hand down and immediately mirror the movement with your left hand tapping your right shoulder.
- Make it easier: Perform the shoulder taps with your knees resting fully on the floor, while actively pressing through your palms to keep your shoulder blades engaged and stable.
- Make it harder: Move your feet closer together to drastically narrow your base of support, exponentially increasing rotational instability.
5. The Single-Leg Glute Bridge
- Reps: 10 repetitions per side | Rest: 1 minute
- Execution: Lie on your back with your knees bent and both feet flat on the floor, hip-width apart. Extend your right leg straight out so it aligns parallel to your bent left thigh. Drive your left heel into the floor, squeeze your glutes, and lift your hips toward the ceiling until your body forms a straight line from your shoulders to your left knee. Lower down with control. Complete all reps on one side before switching.
- Make it easier: Perform the movement with both feet planted firmly on the floor (a standard bilateral glute bridge).
- Make it harder: Pause and hold the contraction at the top of each repetition for three seconds, or place a weighted dumbbell securely across your hips to build explosive strength.
Future Outlook: The Modern Integration of Strength and Endurance
As the boundaries between pure endurance sports and functional fitness continue to blur, the perception of what makes a successful runner is undergoing a profound shift. We are moving away from the fragile, injury-plagued distance runner archetype and embracing a more resilient, robust athlete.
The integration of structured core routines like Sam Tomlinson’s five-move circuit represents a paradigm shift in how we approach running longevity. In the future, sports medicine professionals anticipate that injury prevention protocols will prioritize neuromuscular stabilization and pelvic control just as heavily as weekly mileage accumulation and nutritional periodization.
For everyday runners, weekend warriors, and competitive ultramarathoners alike, the message is clear: building a formidable engine requires a chassis capable of handling the horsepower. By dedicating just fifteen to twenty minutes a week to developing the glutes, hips, lower back, and deep trunk stabilizers, runners can protect their joints, refine their biomechanics, and ultimately rediscover the pure, unadulterated joy of movement—mile after comfortable mile.
