You don't ever want to stretch cold muscles, so choose dynamic (moving) stretches, such as arm or leg circles before you exercise. (thebettyrocker.com)
When you can perform many straight leg raises, the next step is the hanging leg circles. (abmachinesguide.com)
Picture key: 1) Donald Rehm, handstand on parallel bars; 2) Dion Weissend, straddle leg support; 3) Chuck Fegley, half turn on trampoline; 4) Bill Paxton, back somersault with layout; 5) Burritt Haag, climbing 20 - foot rope; 6) Karl Schwenzfeier, free handstand on rings; 7) Hugh Cline, double leg circles on side horse; 8) Charles Marshall, handstand on floor. (si.com)