We’re hooked on this 30-minute TRX workout for many reasons, but we’ll keep it short. The straps hanging from the ceiling allow you to use your own body weight for resistance training, and that’s more fun than doing the hamster thing on a treadmill. Trainers are dedicated to helping them meet their personal fitness goals. The gym is clean. The classes are short. Like, half-an-hour short. This is perfect for busy and lazy people. Want to try it before you buy it? (It’s a tad bit pricey.) Sign up for a free class online.