myosource.com/gymnastics/ Gymnastics trampoline Conditioning training with Myosource Kinetic Bands. Training the Core muscles for strength power Elite Gymnastics uses the bands in their strength and conditioning training every day. explosion balance and endurance. Leg strength for tumbling jumps flexibility training endurance training These young gymnast train with the Kinetic Resistance bands to help develop the Core muscles, balance and endurance during their normal conditioning training.