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How to tone legs while sitting
Rotate your ankles.
Rotate your ankle in a circle, moving either clockwise or counterclockwise, for 5 seconds. Then, repeat the process but rotate your ankle in the opposite direction.
Do 3 sets of 20 repetitions and then repeat with the other ankle. If you don't want to have to count, set a timer for 1 minute instead of counting out 20 repetitions.