20-Min Full Body HIIT

Five bodyweight exercises in timed sets — no equipment needed. Work 45 seconds, rest 15 seconds, repeat for four rounds. Under 20 minutes total.

Burpees 4x45s rest 15s
Jump squats 4x40s rest 20s
Push-ups 4x45s rest 15s
Mountain climbers 4x45s rest 15s
High knees 4x45s rest 15s