Of course,
cycling form matters when you're riding outside, too, but in an
indoor class, the intensity of the training, coupled with the fact that you don't have to deal with wind resistance or
balance challenges, makes minding your posture even more essential.
Some that failed to make the top 20 that were there in previous years include Pilates, running clubs, water workouts, stability ball workouts, dance
classes, boot camp,
indoor cycling,
balance training, exercise for obese kids, worksite health promotion, and smartphone exercise apps.