Libra is a no-equipment tone circuit for the sign of the scales: 10 side knee-to-elbow, 10 squat step backs, 10 squat hold calf raises, 10 side jacks, 10 knee-to-elbow and 10 side leg raises. Six exercises, and nearly every one of them asks the same quiet question: can you stay level while one half of your body does something the other half is not?

Balance is the organizing principle, which is only fitting. The circuit is dominated by unilateral and lateral work - side knee-to-elbow, knee-to-elbow and side leg raises all load one standing leg while the other moves, turning your hip stabilizers and obliques into the referees that keep your torso upright. The squat step backs shift your base of support mid-squat, and the squat hold calf raises are the purest test on the card: rising onto your toes while holding a deep squat shrinks your base to almost nothing and asks your ankles, calves and core to negotiate every degree of sway. Even the side jacks, the one purely cardio station, travel laterally. Everything here weighs one side against the other and demands they come out even.

In side knee-to-elbow, lift the knee to the side and bring the same-side elbow down to meet it, keeping your torso tall rather than collapsing toward the knee. In squat step backs, stay at depth while the foot travels - the squat does not rise just because a leg is moving. During squat hold calf raises, fix your eyes on a point ahead and rise slowly; speed is the enemy of balance. Side leg raises finish strict: hips level, torso still, the leg strictly sideways.

The scales don't reward the stronger side. They reward the side that holds steady.

Make it Harder: Do the squat hold calf raises with your hands off your hips and arms extended forward.

Make it Easier: Rest fingertips on a wall or chair back for the squat hold calf raises and side leg raises.