Bulgarian split squats
This challenging unilateral lower-body exercise requires balance, coordination, power, and strength.
Stand about 2ft in front of a sturdy hotel-room chair, facing away, or if there's not a chair available, go ahead and use the bed. Shift your weight to your right and lift your left foot behind you, placing the top of your left foot on the chair. Once you've gained your balance, with your weight centered in your right heel, bend both knees and lower yourself into a single-leg squat as you reach your hands toward the ground on either side of your right leg.
From this low-squat position, press powerfully through your right heel, extending your right knee completely as you return to standing, continuing the motion to rise up onto the ball of your right foot as if you were about to hop into the air.
Immediately lower yourself into another split squat and continue. Switch legs after 30 seconds.