Last year I participated in an online fitness walking class at the local college. It was definitely worthwhile and I learned a bunch from it.
Week 1 - Online introductions, Learning Objectives, PAR-Q form
Week 2 - Garmin FR60 details, Target Heart Rate Worksheet
Week 3 - Three Part Workout & Rockport Walk Test
Weeks 4 & 5 - Cardiovascular Endurance
Weeks 6 & 7 - Muscular Strength
Weeks 8 & 9 - Muscular Endurance