You've made it my duty to keep everyone on this station in good physical condition. The last time I checked, sir, you are part of everyone on this station. By my account, you've missed the past 5 scheduled fitness tests.
If you're uncomfortable with some of the exercises and performing them in front of the crew, I can schedule you time in the fitness center where it's just the two of us.
Remember, you wouldn't just be doing this to help yourself but to set an example for the whole staff.
Thanks so much!