Skill
8 rounds:
20 second supine plank
20 second hollow hold
20 second rest

Modify the difficulty of the hollow hold so that you can stay active for the full 20 seconds each round.

Workout of the Day
AMRAP in 20 minutes:
400 m run, row, or ski, or 1000 m bike
30 medicine ball sit ups
30 medicine ball step ups

Running, rowing, skiing, and biking are all considered rx for this workout. Pick your favorite, and enjoy!

standard: 14/10 lb, 24/20″
rx: 20/14 lb, 24/20″
sport: 20/14 lb, 24/20″
overachiever: 30/20 lb, 24/20″