Calf Jumps

1. Stand strong, with your feet placed at about shoulder width apart, a slight bend at the knee, with your elbows bent loosely at your side or your hands placed lightly behind your ears

2. Keeping your body upright and with no aid from your upper legs, lightly, but explosively jump off the balls of your feet in an upwards direction

3. As you land, allow your knees to bend and take the impact before repeating for the specified amount of reps or time