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Can you overtrain doing isometric exercises???

Ok check it out. I just got these 2 ankle weights 10 pounds each. I jsut finished doing 10 sets of 10 (hold for 5 sec at the top) leg lifts with both strapped to my left leg (20 pounds total). Now my question is, is it ok do do this about 2 times A DAY for a month or should I do it every other day to avoid overtraining to allow it to grow? Thanks