Start by lying flat on your back on a yoga mat, holding a dumbbell with both hands at the base of the dumbbell. Bend your knees and position your feet firmly on the mat, ensuring that they are hip-width apart. Extend your elbows to hold the dumbbell directly above your chest. This is your starting position.
Take an inhale. Without changing the angle of your elbows, draw the dumbbell backward and over your head until the dumbbell is almost touching the floor.
Exhale and draw the dumbbell upward and forward in the same arc-like motion to return to the starting position, ensuring that the angle of your elbows remains unchanged.
This counts as one rep.
Repeat for 50 seconds, then take 10 seconds of rest.