This boat workout is great to do when you are confined to the boat. If you do not have a practical spot to do pull ups then attach your rings to a halyard and get moving!
Boat Fit
Boat Workout #2
5 rounds as fast as possible
10 pull-ups (different grip every round) *ring rows for substitute
15 push-ups
20 air squats
Proper technique on any movement is important to prevent injury. Watch this video to learn the proper technique of an air squat.
Have fun!