Today at the gym I realized that like almost every other day, a crowd of people gather around one of the fitness rooms before group exercise classes. Several people start waiting a good 10-15 minutes before the class starts and I can't help but think what a waste of time that is.
If you find yourself waiting around for a class or machine, make use of that time. Jump on a treadmill and get five minutes of walking in. Do squats, crunches, or lunges. Do anything really. I don't know about you, but getting to the gym can be a difficult task at times so maximize that time to get the most out of your workout. Five minutes getting warmed up is not going to hurt you, in fact it'll just prepare you for the exercise you are about to begin and you'll burn more calories in the end.