Not all pools have stairs but you can still perform this exercise by using aqua aerobic stepper instead. Jumping in the pool, unlike on dry-land, creates high intensity, yet smaller impacts on your joints.
Jumping in the pool also engages more muscle groups, especially you upper body muscles, and keeps you cool and refreshed all the time.
In the waist-deep water, stand in front of pool stairs, or put the aqua stepper in front of you. Close your feet together and stand up in a good posture. Put your arms by your sides.
Jump with both your legs together up one stair, or on top of aqua stepper and pull your arms simultaneously, then step down with one leg at the time. Perform until breathing becomes difficult, rest and then repeat again.
Feel your quadriceps, core and upper back muscles.
Inhale as you ascend stairs and exhale as you jump up.
Tip: If you find it hard to balance during the jumps, use a pool noodle and hold it in front of you.