You don't need a gym. You don't need dumbbells, kettlebells, resistance bands, or a pull-up bar. You don't even need shoes if you're on a soft surface. The most effective HIIT workouts use nothing but your bodyweight and a timer.
A 2021 study found that bodyweight HIIT (burpees, mountain climbers, jumping jacks, squats) significantly improved cardiovascular function in just 6 weeks — 10 minutes per session, 3 days per week. No equipment was used. 📄 Ramos et al. 2021 — J. Sports Sciences
Choose exercises that move multiple joints and large muscle groups. Squats, burpees, lunges, and mountain climbers demand more oxygen than bicep curls or calf raises — which means higher heart rate, more calories, and faster cardiovascular adaptation per second of work. 📄 MacInnis & Gibala 2017 — J. Physiology
Workout 1: The Starter (12 min)
For people in their first 1-4 weeks of interval training. Exercises are low-impact and scalable. Rest is generous.
Workout 2: The Builder (16 min)
For people who've been doing intervals for 4+ weeks. Equal work and rest. Four exercises in a circuit. This is the sweet spot for general fitness. 📄 Milanović et al. 2015 — Sports Medicine
Workout 3: The Burner (18 min)
For experienced interval trainers. Shorter rest, explosive movements, more rounds. This targets both aerobic and anaerobic systems simultaneously. 📄 Tabata et al. 1996 — Med. Sci. Sports Exerc.
The single best no-equipment HIIT exercise: The burpee. It uses every major muscle group, spikes your heart rate to 85-95% of max within seconds, requires zero equipment, and can be modified (step back instead of jump back for beginners). If you could only do one exercise for the rest of your life, a timed set of burpees with rest intervals would cover more fitness bases than anything else. 📄 Weston et al. 2014 — Sports Medicine
What This Means for Your Workout
Pick the workout that matches where you are today. Do it 3 times this week. When it starts feeling manageable across all rounds, move to the next level. That's the entire system — three workouts that scale from beginner to advanced, all under 20 minutes, all requiring nothing but floor space and a timer.
SUPER INTERVAL TIMER — THE APP
A simple app to organize your workouts.
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SOURCES (5 peer-reviewed studies)
- Ramos JS, et al. Effect of whole-body high-intensity interval training on heart rate variability in insufficiently active adults. Journal of Sports Sciences. 2021;40(1):83-92.
- MacInnis MJ, Gibala MJ. Physiological adaptations to interval training and the role of exercise intensity. The Journal of Physiology. 2017;595(9):2915-2930.
- Milanović Z, et al. Effectiveness of HIIT and continuous endurance training for VO2max improvements. Sports Medicine. 2015;45(10):1469-1481.
- Tabata I, et al. Effects of moderate-intensity endurance and high-intensity intermittent training on anaerobic capacity and VO2max. Medicine & Science in Sports & Exercise. 1996;28(10):1327-1330.
- Weston M, et al. Effects of low-volume high-intensity interval training on fitness in adults. Sports Medicine. 2014;44(7):1005-1017.
