J.C.
Hi T.,
Although it's not aerobic, yoga is great for strength, toning, and relaxation. I am a working mom who finds it hard to get to the gym anymore, and the classes I want to take are never when I have the time or motivation. I found myyogaonline.com is just the ticket. For $10 a month I have access to a ton of different yoga and pilates classes. The site allows you to pick a class of less than five minutes up to 90 minutes, which is great because it helps me fit the workout with the time I've got and with the mood I'm in. The classes are very high quality and they are offered for a range of ability levels, including beginner.
Good luck!
J.