Compound movements like the squat-to-press load the hips, knees and shoulders through a coordinated kinetic chain. Joint force depends on the external load plus the rig's own body-segment weight, resolved through each joint's moment arm; power is the rate at which that force moves the load through space, which is why fast, heavy reps generate the highest instantaneous power.
Power = Force × velocity
Torque = Force × moment_arm
1RM (Epley) ≈ load × (1 + reps/30)
- Exercise selector — switches the movement pattern (squat-to-press, lunge, loaded carry), each stressing joints differently.
- Load — the external weight the rig carries; raises peak joint force and estimated 1RM.
- Movement speed — faster reps raise instantaneous power output for the same load, up to a technical limit.
- Reset rep — restarts the rep cycle from the top position.
Strength coaches use force-velocity profiling like this to prescribe load and tempo that best build power for a given sport.