Skill
8 rounds:
20 second arch hold
20 seconds of Russian twists
20 seconds of rest

Use a 5-15 pound plate for the Russian twists, and have fun with some low-impact core work!

Workout of the Day
Every 3 minutes for 7 rounds:

400 m run, row, or ski, or 1000 m bike

Record the slowest round of rounds 3 through 7 as your score. This means that you can use rounds one and two to gauge your pace and try to find something sustainable for the last 5 rounds.