Day 2: Hollow Rocks Complete 4 sets of 30sec rocks with a 20sec breather between sets - this will be your workout for challenge #2. If 30sec is too much, scale back to 15 - 20sec and build up overtime. Don't forget to share your score via the hashtag #GL30dayabs - Keep legs and arms long and strong - Make the rock small - If your lower back hurts during this move, come back to knees over hips and hold for 30sec | Goodlife Health Clubs Australia