Stand upright with your legs shoulder-width apart with your hands on your hips and your fingers facing in towards your stomach.
Tighten the abdominals to stabilize the trunk.
Now move down into a squat with your heels flat on the floor.
As you move into the squat, bend your trunk forwards from the hips and reach downwards with straightened arms as far as your mobility permits.
Then, move up out of the squat forcefully, without over stressing the lower limbs, and at the same time raise your arms upwards, over your head if possible.
As you move upwards keep your trunk and legs aligned. Do not leap into the air as per the standard power jump until your fitness level permits.
Return to the starting position and repeat for the desired number of repetitions at a moderate pace.