Every minute on the minute 

(If reps take 40 secs your will get 20 secs rest before the next exercise)

Min 1 : 5/5 Lunges + 10 Squats 

Min 2 : 30 Star Jumps

Min 3 : 10 Push Ups + 10 Dips 

Min 4 : 30s High Knees/Skipping

Intervals 

30s work, 15s rest 

1. Plank Hold
2. Plank-Up
3. Russian Twist