Hollow Body Single Arm Dumbbell Floor Press

The hollow body single-arm dumbbell floor press is a unilateral pressing exercise performed lying on your back in a braced hollow body position. It builds pressing strength in the chest, shoulders, and triceps while forcing the core to resist rotation as one arm works independently against an offset load. Because the upper arm rests on the floor, the range of motion is shorter than a bench press, reducing shoulder strain and making it a useful option for lifters managing shoulder issues. The single-arm setup also exposes and helps correct left-right strength imbalances.

Muscles Targeted

• Primary: Pectoralis major, anterior deltoid, triceps brachii
• Secondary: Rectus abdominis, obliques (anti-rotation)
• Tertiary: Serratus anterior, rotator cuff stabilizers

Starting Position

Lie on your back on the floor with knees bent and feet flat, or legs extended straight for a deeper hollow hold. Press your lower back into the floor, ribs down, and lift your shoulders and legs slightly off the ground to establish the hollow position. Hold a dumbbell in one hand with your upper arm resting on the floor at roughly a 45-degree angle from your torso, forearm vertical and elbow bent. Rest your free arm flat on the floor or across your stomach for added stability.

Execution Steps

1. Set the hollow brace by flattening your lower back into the floor and keeping your ribcage pulled down before you press
2. Press the dumbbell straight up over your shoulder, driving through a controlled path without letting your torso rotate toward the working side
3. Lock out the arm fully at the top while keeping the hollow position intact
4. Lower with control, tracing the same path back until your upper arm lightly touches the floor
5. Reset briefly without relaxing the hollow brace, then begin the next rep
6. Complete all reps on one side, then switch arms and repeat, keeping the non-working side just as tight

Form Cues

• Keep the upper arm at roughly 45 degrees from your torso rather than flared out to the side
• Press the lower back into the floor throughout every rep, not just at setup
• Resist rotation: don't let your hips or shoulders twist toward the pressing arm
• Exhale as you press, inhale as you lower
• Anchor the non-working arm and leg firmly so only the pressing arm and shoulder move

Common Mistakes

• Losing the hollow brace and letting the lower back arch off the floor, which shifts load away from the core and increases the injury risk on the spine
• Letting the torso rotate toward the working arm, which turns a core-stability exercise into a twisting motion and reduces its purpose
• Using a dumbbell too heavy to control, forcing momentum and sacrificing the hollow position
• Bouncing the dumbbell off the floor at the bottom instead of pausing and controlling the touch
• Flaring the elbow out to 90 degrees, which stresses the shoulder joint unnecessarily

Variations

• Standard single-arm dumbbell floor press: same movement without the strict hollow hold, useful for beginners building pressing strength first
• Two-arm hollow body dumbbell floor press: presses both arms together, easier to balance but removes the anti-rotation demand
• Single-arm barbell floor press: allows heavier loading once dumbbell strength and stability are established
• Tempo floor press: adds a 3-4 second lowering phase to increase time under tension
• Banded hollow hold press: adds light band resistance across the chest to intensify the anti-rotation challenge

Tips for Progression

• Increase dumbbell weight in small increments once you can complete all reps without losing the hollow position
• Extend the length of the hollow hold by performing more total reps per side before resting
• Straighten the legs further off the floor to make the hollow position more demanding
• Slow the tempo, especially the lowering phase, to increase time under tension
• Pair with anti-rotation carries or planks to reinforce the core stability this exercise trains

Training Notes

Program the hollow body single-arm dumbbell floor press 1-2 times per week as an accessory press or a core-stability-focused finisher after heavier bilateral pressing work. Use 8-12 reps per arm for 2-3 sets, resting 60-90 seconds between sets. Because the hollow brace is demanding on its own, keep the loads moderate and prioritize maintaining the position over adding weight.