HIIT alternates hard efforts with recovery periods to create a compact, high-intensity conditioning session. The work intervals are usually short and demanding, so the session can create a strong cardiovascular load in limited time. It is effective, but the intensity makes pacing, recovery, and frequency important.
Exercise Metrics
Fitness Profile [1]
Heart Rate Zones [2]
Activity Type Details
Calorie Burn
Estimated active Calories per 30 minutes of exercise for the MET range 7 - 11. Active Calories exclude the energy your body would use at rest.
| Body weight | Estimated active Calories / 30min |
|---|---|
| 50 kg (110 lb) | 158 - 263 Cal |
| 60 kg (132 lb) | 189 - 315 Cal |
| 70 kg (154 lb) | 221 - 368 Cal |
| 80 kg (176 lb) | 252 - 420 Cal |
| 90 kg (198 lb) | 284 - 473 Cal |
| 100 kg (220 lb) | 315 - 525 Cal |
Actual energy use varies with intensity, fitness, movement efficiency, and individual physiology. Learn more in the "How to Estimate Calories Burned with MET Values" resource.
Training advice
Benefits
HIIT is time-efficient and powerful for improving high-intensity repeatability, aerobic capacity, and tolerance for hard efforts. It works best when the hard intervals are truly purposeful and the recoveries are protected.
What to watch out for
This is not an everyday default. Warm up well, keep technique clean, stop if symptoms feel unusual, and leave enough recovery between sessions because intensity multiplies injury and fatigue risk.
Explore other Activity Types in the Cardio category: