Time to take your plank training to the next level. In Part 3 of the Core HIIT Series, we’re targeting the obliques and rotational strength  with three side plank variations. This plank HIIT workout  is designed to carve out your side core, improve spine stability, and give you serious midsection endurance - all in under 10 minutes. The Workout Format: 45 seconds work per move 15 seconds rest between moves Perform on both sides (where applicable) 3 rounds total Rest 1 minute