A good exercise to strengthen knees...
Lie on the bed on your back... put a couple of pillows under your knees...
Lift your legs to straight (no higher - don't lift your thighs)
Repeat up to 100 times...
As your legs get stronger - or if they are already strong, attach a weight to your ankles (just a small one) for extra resistance... a pillow balanced on top can be enough
Have fun working out!
LOL... Time to workout... I'm just off to lie down



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