Place Swiss ball between your lower back and a wall. Lean against the Swiss ball with your feet firmly planted about 12” in front of you. Lift one leg off the ground, keeping the other knee soft and leg straight.
EXHALE: Raise your heel off the ground as high as possible. Hold for 1-2 counts.
INHALE: Slowly lower to the starting position (without letting heel touch the ground) to complete one rep.
Finish all reps and switch sides.
Keep knee only slightly bent or else you will be placing too much emphasis on your quads.
Make it easier: Two-leg calf raises following the same instructions.
Muscles Worked: Calves