The debate over free weights and machines is a long one, and the fact that you alternate is excellent, as they both have their advantages and disadvantages. The advantage of free weights is their versatility, adaptability and the fact that more muscle groups are generally required to lift free weights, as these exercises require coordination, balance and core stabilization. Theoretically, the 50-pound bar is not any heavier than two 25-pound dumbbells, however, you may recruit your core stabilization muscles better with the free weights than when using a cable.

ANSWERED BY:
Erin Boynton, MD, FRCSC, an orthopedic surgeon specializing in sports medicine and shoulder surgery. She was the first woman to work as an orthopedic surgeon in the NHL, MLB and CFL.