Aquatic Conditioning
Aquatic Resistance-Boot Knee Extension
The aquatic resistance-boot knee extension is a supported pool exercise that trains the front of your thigh by straightening your knee against water resistance.
- Beginner
- Isolation
- Low injury risk
- Rest 1 min
How to do it
- Fit the aquatic resistance boots securely before entering the pool.
- Enter waist- to chest-deep water using pool steps.
- Hold a pool rail or edge for support.
- Bend one knee so your heel moves behind you, with your thigh beneath your hip.
- Straighten that knee until your leg is nearly straight.
- Bend your knee back to the starting angle.
Form cues
- Keep your thigh still.
- Let your supporting knee stay soft.
- Breathe evenly throughout the set.
Common mistakes
- Leaning to move the bootKeep your ribs over your hips so your torso does not help drive the movement.
- Twisting the working legKeep your knee and toes pointing in the same direction throughout the repetition.
- Jerking through direction changesUse a steady pace with a smooth reversal between straightening and bending.
Safety
Water drag increases with speed, so forceful movements can strain your knee. A loose boot or loss of footing can upset your balance in the pool.
- Start with low-effort repetitions to learn how much resistance the boots create.
- Stop the set if a boot shifts or loosens.
- Keep your supporting foot planted on a nonslip pool surface.
- Use supervision if you are not confident in the water.
If you have knee pain, recent knee surgery, or significant balance limitations, ask a physiotherapist or doctor about a suitable range and level of resistance first.
Muscles worked
Primary muscles
Secondary muscles
Equipment
- Aquatic Resistance Boots
Sets and reps
- Sets
- 2–3
- Target
- 10–15 reps per side
- Rest
- 1 min
Complete the repetitions on one side before switching legs.