Not days in the gym, of course. Just skip out on the weights in favor of one of the most efficient pieces of equipment you probably laying around: the jump rope.

If you haven't picked up a rope since your elementary school days, never fear: This isn't just a kid's toy. The mindless, simple activity of your youth is actually one of the best ways you can take your HIIT workout to the next level.

Skipping rope is one of the most effective cardio exercises around, per a study that found just 10 minutes a day with the rope was comparable to 30 minutes of jogging. Experts tout the activity's benefits as a certifiable full body workout that promotes good heart health, too.

Grown-up skipping is focused on speed and coordination, so leave your slow schoolyard pace behind. Here's a quick explainer on how you should approach your skips.

Skip on both feet for 10 skips, then shift to your right foot for 10 skips, then your left for 10 skips. Go back to both feat for 9 skips, then right and left for 9 each. Keep dropping a rep until you hit zero.

Need a rope? Check out these options.

Jump Roping for HIIT

Once you're really a rope pro, add a jump rope to high intensity interval training (HIIT) , and you're in for a hell of a workout. It'll be quick, too-you won't have to spend the hours on the treadmill you might have for otherwise similar results. Just don't overdo it. Tackle a HIIT workout about once a week , especially if you're adding onto a weight training program.

Check out this helpful video from Bloom to Fit to learn some new HIIT moves to add to your jump rope playbook. There's way more to do than just boring skipping in place, so spice up your routines with these variations.

Here are four HIIT workouts that use a jump rope and body weight moves that will push your cardio to the next level. Skip as many times as possible using proper form in the allotted time. Repeat each circuit five times.

1. The Basic - Easy

• Standard jumps - 20 seconds
• Rest - 10 seconds
• Right foot hops - 20 seconds
• Rest - 10 seconds
• Left foot hops - 20 seconds
• Rest - 10 seconds
• High knee jumps - 20 seconds
• Rest - 10 seconds
• Standard jumps - 20 seconds
• Rest - 10 seconds
• Rest one minute.

Total workout time: 17.5 minutes

2. The Jack and Squat - Medium

• Jump rope jacks - 20 seconds
• Rest - 10 seconds
• Body weight squats - 20 seconds
• Rest - 10 seconds
• Side to side jumps - 20 seconds
• Rest - 10 seconds
• Alternating bodyweight lunges - 20 seconds
• Rest - 10 seconds
• Jump rope jack - 20 seconds
• Rest - 10 seconds
• Rest one minute.

Total workout time: 17.5 minutes

3. The Fighter - Hard

• Boxer step - 30 seconds
• Rest - 10 seconds
• Off step jump - 30 seconds
• Rest - 10 seconds
• Criss cross jump - 30 seconds
• Rest - 10 seconds
• High knee jumps - 30 seconds
• Rest - 10 seconds
• Boxer step - 30 seconds
• Rest - 10 seconds
• Rest one minute.

Total workout time: 22 minutes

4. Skipmaggedon - Intense

• Criss cross jump - 45 seconds
• Rest - 15 seconds
• Backwards jump - 45 seconds
• Rest - 15 seconds
• Alternate foot criss cross - 45 seconds
• Rest - 15 seconds
• Mummy kicks - 45 seconds
• Rest - 15 seconds
• Double under - 45 seconds
• Rest- 15 seconds
• Rest 2 minutes

Total workout time: 35 minutes