BOSU Unstable Upchop
A diagonal up-chop performed while balancing on the BOSU, driving a weight from low hip to high overhead to train rotational core power.
Level: Intermediate
Primary: Abs
Secondary: Glutes Shoulder
Movement: Isolation
Tags: Balance / Stability Rotational
Type: Functional Fitness (Obstacle & Hybrid)
Equipment: Balance Trainer
Target muscles
The up-chop is a rotational, anti-rotation hybrid. The obliques generate the diagonal drive from low on one hip to high above the opposite shoulder, the rectus abdominis and transverse abdominis stabilise the spine, and the shoulders and upper back guide the weight up. Standing on the dome forces the glutes, hip and ankle stabilisers to keep the base steady while the trunk rotates, so the whole core works as an integrated unit.
How to perform
Setup
Stand on the dome with feet hip-width, holding a light weight or medicine ball in both hands down by one hip. Brace the core, soften the knees, and settle your balance before moving.
Execution
Drive the weight diagonally up and across the body, finishing high above the opposite shoulder as you rotate through the trunk and let the hips and feet pivot slightly to follow. Control the weight back down to the starting hip on the same path. The power comes from the core rotating, not from the arms swinging — keep the chest tall and the movement smooth on the unstable base. Complete the reps on one diagonal, then switch sides.
Common mistakes
- Swinging with the arms while the trunk barely rotates.
- Letting the lower back arch as the weight goes overhead.
- Losing balance because the feet and hips don't pivot with the rotation.
- Using too heavy a weight so control of the dome is lost.
Progressions and regressions
Regress by performing the up-chop on the floor, or with a kneeling or split stance for more stability. Progress by adding load, increasing speed for power development, or holding the top position briefly each rep.
Programming notes
Use it as rotational core and power-transfer work, 2-3 sets of 8-12 reps per side. It trains the trunk to transfer force between the lower and upper body on a diagonal, which carries over to throwing and swinging sports. Keep the load light enough to move with control and pair it with a low-to-high or high-to-low chop on the cable for variety.
