Resistance bands have become all the rage and for a good reason. Patty Soud, an ACE- and ACSM-certified trainer and owner of Fitness by Patty, loves this Bodylastics Resistance Band Set ($50), because the bands are lightweight, portable, easy to store, and can be used for every muscle group. "[Resistance bands] offer significant resistance to the muscles without the wear and tear on joints that heavy weights can often leave," Soud told POPSUGAR.