It takes concentration and focus to use telekinesis. So basically a lot of effort without being distracted. There was an old scan I seen ofjean and storm practicing or fighting. It looked like a 1980 comic and she pointed the exact same thing. It took no effort at all for her to use her wind powers. Gravity is the best what goes up must come down and a lot of them from cable to jean grey struggle with keeping massive objects a float
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