Lisa is beginning a weight-training program to firm up and gain muscular strength. She has decided to do some cycling or treadmill jogging to warm up, stretch before the workout and lift weights that isolate each muscle group in her body. She'll take the time to stretch before she leaves the gym. She is so dedicated that she is going to do this workout every day. After doing this for a few months, what may be the biggest concern? A. Lisa could experience burnout from spending so much time in the gym. B. Lisa could become obsessed with how she looks. C. Lisa might lose her friends because she is devoting too much time to working out. D. Lisa might experience symptoms of overtraining, like weight loss and increased irritability.