3. Resistance Band
Don’t get the wrong idea when we say this, but a little bit of latex—or rubber—goes a long way. A recent study showed that using bands–also known as resistance bands or stretch cords–can be as effective at improving strength as weight machines. These stretchy training tools work to build muscle mass and power by adding resistance as you pull, lift, and stretch. Plus, they’re cheap and portable enough to pack anywhere, so you’ll never have an excuse for skipping out on a toning session.