Side Plank

Definition

The side plank is a bodyweight isometric exercise performed by supporting your body on one forearm and the side of one foot, forming a straight line from head to ankles. It primarily trains the obliques and quadratus lumborum through anti-lateral flexion - resisting the force of gravity pulling your hips toward the floor. For HYROX^® athletes, the side plank builds the lateral core stability that prevents energy leaks during running and loaded carries.

Technique & Form

1. Lie on your side with your elbow directly beneath your shoulder, forearm perpendicular to your body. Stack your feet or stagger them (top foot in front) for more stability.
2. Brace your core and lift your hips off the floor until your body forms a straight line from head to ankles. Your top arm can rest on your hip or extend toward the ceiling.
3. Squeeze your obliques and glute on the bottom side to maintain a rigid, straight position. Do not let your hips sag or pike upward.
4. Hold for the prescribed duration while breathing steadily. Maintain the straight line throughout - check in a mirror or with a training partner.
5. Lower with control, rest, and repeat on the opposite side. Always train both sides equally.

Muscles Worked

• Primary: External and internal obliques, quadratus lumborum
• Secondary: Gluteus medius (bottom side), transverse abdominis
• Stabilizers: Shoulder stabilizers (rotator cuff, deltoid), adductors, erector spinae

Common Mistakes

• Hip sagging: The most common error - indicates insufficient oblique strength. Reduce hold time and focus on squeezing the bottom-side glute.
• Rolling forward or backward: The body should remain in a perfect lateral plane. Engage your core as though someone might push you from the front.
• Holding breath: Breath-holding limits hold duration and spikes blood pressure. Breathe in for 3 counts, out for 3 counts throughout.

Benefits

• Develops lateral core stability critical for efficient running mechanics
• Strengthens the gluteus medius to reduce hip drop during single-leg stance
• Builds shoulder stability on the supporting arm
• No equipment required - ideal for warm-ups, cool-downs, and travel training

HYROX^® Context

Lateral core stability is essential for efficient HYROX^® running. Each running stride is a single-leg stance that demands anti-lateral flexion from the obliques and gluteus medius. Weak lateral core muscles cause visible hip drop and trunk sway, wasting energy across 8 km of running. The side plank also transfers to the Farmers Carry, where athletes must resist lateral trunk flexion under heavy bilateral kettlebell load. Program 3 sets of 30-45 seconds per side as warm-up activation or accessory work.

Variations & Alternatives

• Reverse Plank - posterior chain isometric for complementary postural work
• Renegade Row - anti-rotation core training with a dynamic pulling component
• Superman Hold - prone posterior chain isometric for erector spinae endurance

FAQ

How long should I hold a side plank? Start with 3 sets of 20-30 seconds per side. Progress to 45-60 seconds. If you can hold longer than 60 seconds easily, add difficulty with hip dips, leg lifts, or weight.

Should I do side planks every day? Side planks are low-impact and can be performed daily as part of a warm-up routine. However, 3-4 times per week is sufficient for most HYROX^® athletes to maintain lateral core strength.

Add side planks to your HYROX^® warm-up with ROXBASE - the hybrid athlete's training platform.