Hollow Hold

The hollow hold is the core position of gymnastics and calisthenics. You lie on your back, press your lower back flat into the floor, and lift your shoulders and legs off the ground so your body forms a shallow banana shape. It looks gentle. It is not gentle. Thirty seconds will humble anyone who thinks their core is strong.

Why it matters: every advanced skill — front lever, L-sit, muscle-up, handstand — is essentially a hollow hold in a different orientation. Locking in this shape now saves you months of re-learning it on the bar or in a handstand later. Think of it as the plank's more demanding cousin.

How to do it

Lie flat on your back. Press your lower back hard into the floor so there's no gap between your lumbar spine and the ground. Lift your shoulders and legs off the floor at the same time, arms extended overhead by your ears and legs straight. Point your toes. Your body should form a slightly curved "banana" with the floor as a tangent point at your lower back.

Target

Hold for 30 seconds with lower back flat on the floor throughout.

Key tips

• Press your lower back into the floor — if you see a gap, tuck your pelvis more
• Start with knees bent and arms at your sides; straighten legs and raise arms overhead as you get stronger
• Breathe shallowly — don't hold your breath
• If your lower back pops off the floor, stop the hold; quality over time

Progression

Before this: own the Plank for 30 seconds first. The plank teaches the same "don't bend, don't arch" core lesson in an easier position.

Next step: once you can hold 30 seconds clean, take it to the bar with the Hanging Knee Raise in Level 3 — same core shape, now with your legs doing the work.