To give you an indication of what you're getting yourself into, drawing a jumping figure is about as difficult as it is to get up from the couch after a long day of work and doing 100 jumping jacks and push-ups. It sure isn't fun and it sure isn't easy, but both will make you a stronger individual in the long run. While exercise of any sort helps you get fit, drawing figures in motion will help you greatly advance as an artist. That's because sketching out moving figures forces you to take into account muscle layout changes, differing proportions, and the effect of action on a body.
Watch this video to learn how to draw a pretty scary figure jumping out towards you. Yeah, it's creepy but you will get a lot better technically at what you do.