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Here’s an example of a HIIT routine:

Complete butt kicks for 45 seconds, and rest for 15 seconds.
Next, perform jumping lunges for 45 seconds, followed by 15 seconds of rest.
Complete burpees for 45 seconds, and rest for 15 seconds.
Repeat for 10 to 20 minutes.
You can also incorporate other movements like mountain climbers and jump squats.
Or, you can try to complete a HIIT workout on a treadmill:

Warm up for 5 minutes.
Then sprint at a high-intensity speed for 1 minute.
Walk for 30 seconds, and then sprint again at a high-intensity speed for 1 minute.
Complete 8 to 10 sets.