If you’re a gym loner you might be surprised how rewarding working out with your friends can be. Choose the right friends and they will help you stay motivated, make sure you are always challenging yourself, keep an eye on your technique, get you to try new things and make your workout experience a lot more fun. This is particularly true for outdoor workouts, which require an element of creativity. Simply grab your friends, hit a park, playground or running path and challenge each other to see who can think of the most exercises to do there. Once the competitive instincts are engaged, you ...