Here's a good site of aerobics videos available online, on-demand. Cardio, Pilates, Boxing, Abs, Hatha Yoga, Power Yoga, Weights, Cardio Jazz, Muscle Conditioning, Buns & Thighs, and more. Good while travelling or on vacation. Membership ranges from $3.99/week for 6 weeks to $9.99/month for 12 months. Purchase and download one fitness video at a time for $1.49 for 30 days. Check out free sample aerobics videos online.