Resistance stretching is all the rage among elite Olympic athletes, but can something as simple as just a stretch make you stronger? Yes, says Michael Schiemer, B.S., CPT, and owner of Frugal Fitness. Plus, it "is an excellent way to increase strength while improving range of motion, reducing injury, and avoiding excess muscle mass gain." Even better, it needs no equipment! To try it for yourself, Schiemer recommends eight of his favorite moves.