Remember what it felt like to run around on the playground at recess as a kid? You were full of energy and probably didn’t even think about the fact that you were getting much needed exercise as you darted across the monkey bars or ran around with your friends. If you’re looking for an alternative to your usual gym routine, it may be time to channel your inner child and take a step back in time to those carefree days.

Gyms around the country are tapping into the fun side of fitness by incorporating recess-style fitness classes into their routines. These classes combine tried-and-true favorites from yesteryear, like jump ropes, hula hoops and relay races to get your heart rate up. But there’s no need to even head to the gym to enjoy childhood fitness fun. Just head to your nearest playground or grab some equipment at home and get moving.

Here are some serious calorie-burning and muscle-toning workouts that will also channel your inner child:

Jump Rope – Grab a jump rope and you’ll do more than just feel like a kid. You can torch some serious calories as you jump over that rope. A 150-pound person can expect to burn about 300 calories in just 30 minutes.

Hula Hoop – Swing your hips as you try to keep your hula hoop in motion and you’ll be well on your way to getting in the recommended 30 minutes of physical activity daily. While you may not be able to immediately hula hoop for 30 minutes straight, you’ll burn over 200 calories in 30 minutes if you do.

Trampoline – There’s nothing like the feeling of jumping up and down on a trampoline, and you’ll be happy to know it’s also a great workout. Head to a trampoline park for some serious jumping and tumbling fun, join a trampoline class or do a mini trampoline workout right at home. You’ll not only burn calories but you may even improve your balance and spatial awareness.

Playground equipment circuit – Monkey bars, parallel bars and even a park bench can be the perfect way to get in a serious bodyweight workout. With this equipment, you can do pull-ups, tricep dips, push-ups, step-ups and other plyometric exercises.

Play childhood games – All you need are a few friends that want to have a good time and aren’t afraid to move and you’ll find plenty of ways to stay fit. Play tag, organize relay races or set up an outdoor obstacle course. You’ll all have a good laugh while getting into shape.