High-Intensity Interval Training (HIIT) involves short bursts of intense exercise followed by periods of rest or lower-intensity activity. It's a highly effective way to burn calories, improve cardiovascular fitness, and build strength. Here are some popular HIIT exercises:

1. **Sprinting:** Sprinting or running at maximum speed for short intervals (30 seconds to 1 minute) followed by a rest period or light jogging.

2. **Jump Squats:** Perform squats and explode upward into a jump, then land back into a squat position. Repeat for a set time or number of reps.

3. **Burpees:** Begin in a standing position, drop into a squat, kick your feet back into a plank position, perform a push-up, return to the squat position, and jump up explosively. Repeat in quick succession.

4. **Mountain Climbers:** Get into a plank position and quickly alternate bringing your knees towards your chest in a running motion.

5. **High Knees:** Stand in place and rapidly drive your knees upward towards your chest, alternating legs as if running in place at a fast pace.

6. **Jumping Lunges:** Start in a lunge position and jump explosively, switching legs mid-air to land in a lunge on the opposite side. Repeat in a continuous motion.

7. **Box Jumps:** Jump onto a raised platform or box, then step or jump back down. Repeat in quick succession.

8. **Battle Ropes:** Use heavy ropes anchored at one end and perform various waves, slams, or alternating arm movements at a high intensity for short bursts.

9. **Cycling Sprints:** Cycle at maximum effort for a short time, then slow down to a moderate pace. Repeat this cycle.

10. **Rowing Sprints:** On a rowing machine, row at maximum intensity for a short period, then rest or row at a slower pace.

Always warm up properly before starting a HIIT session, and if you're new to high-intensity workouts, start gradually and increase the intensity as you build stamina and endurance. HIIT can be adapted to various fitness levels and preferences, making it a versatile and efficient workout option.