Resistance bands were one of the most popular items that trainers recommended to us. "Resistance bands improve overall strength and endurance and increase flexibility and range of motion," said Sam Stauffer, director of training at Spartan, who recommended the AmazonBasics Resistance and Pull Up Band ($13). "Any exercise that can be done with a pulley in the gym can be done with bands," added Tom Biggart, MD, a physical therapist and athletic training and strength and conditioning coach at EBM Fitness Solutions. Small and lightweight, these bands are the perfect space-saving fitness solution, whether you're working out on holiday or in a small apartment. Sam recommended using your bands for strength exercises like pull-ups, squats, and tricep dips, or anchoring it around a pole for rows, presses, or core work.