Absolutely! The definition of overexercising depends on the frequency,intensity and duration of the workouts as well as your fitness level. Signs of too much exercise include fatigue, lack of energy, muscle soreness (general aches and pains or muscle/joint pain),trouble falling/staying asleep, and moodiness. If you suspect you are overdoing it,stop exercising and rest for a few days, paying attention to hydration and diet and see if the symptoms improve. You may need to cut back or cross train.