Lots of information about specific exercises and conditioning plans. Not specifically for boaters, but many articles are useful.
One- or two-day courses on how to prepare for isolated travel, access and treat common injuries and illnesses, and set up a comprehensive medical chest.
Dumbbells (up to 16 pounds each) and ankle weights (up to 8 pounds) that fill with water when you work out, then deflate to a few ounces and a few inches when not in use.
How one cruising couple works out on board. Covers an aerobic workout and strength building, plus stretching, relaxation, imaging, massage, and meditation.
Brief grab bag of tips and commentary on the knowledge and medical equipment you should have, and the injuries and illnesses you are likely to encounter. Contains excerpts from hard-to-find bulletin board and newsgroup postings, as well as links to useful sites and vendor pages.