Hi and welcome to the forum.
I guess you are shooting levitation by letting your model jump, right? So you need a faster shutter speed to freeze the motion. Try 1/500sec as a starter (and a well lit scene - daylight at best sun). If that is still blurring your shot, use 1/1000sec, 1/2000sec,...
In regard to lag - that depends on the camera, your ability to anticipate the movement and the way you communicate with the model. The more experience you have (also shooting sports), the better you'll get. Continuous shooting is an option if your camera supports high framerates (min 5fps).
You could also use an object to levitate your model, like a stool, ladder, etc. Take one shot with model and stool, one without (both from a tripod same settings), and mask the stool in photoshop.
Does that help?