I jumped just once in my live (about 25 years ago). My reason for jumping was to test, first hand, Einstein's assertion, that gravity is NOT a force. I jumped for for about 5 seconds I felt nothing pulling me down. Then of course my speed picked up and I felt the air resistance and that was the only force on my body. No tug, no pull toward the earth. It seemed that the earth was moving toward me. Einstein was right. I was happy to prove to myself Einstein was right and I never jumped again. My jump was from 9500 feet. Once was enough.,