Descending time interval latter: 70s, 60s, 50s, 40s, 30s, 20s, & 10s. 25s rest between rounds. Example: high knees, burpees, jumping jacks, plank hold, rest & repeat with new time.
High Knees
Burpees or Modified Burpees
Jumping Jacks
Plank Hold
Pro Tip: reset timer for new time during rest periods