Tuesday July 23, 1 mile run and body-weight exercises: 2 sets to failure of push-ups, and leg lifts Tip for six-pack abs: Start with exercises that engage the lower abs first. If you start with crunches first (that don't engage lower abs) the upper abs will reach failure before lower abs. Hence a very cut four-pack. To avoid this, start with a lower abdominal exercise first such as the leg raise before crunches. Then, progress to hanging leg raises.