Helps you manage your fitness activitiesCrosstrainer lets you manage your fitness wherever you are. Lose Weight, Build Muscle, Train for an Event. Whatever your goals, there is no better motivation than your success. Crosstrainer is dedicated to people that are interested in improving the health, fitness and general wellnessto people want to change your body shape, lose body fat and gain muscle and want a way to accurately analyse the quality of your meals and workouts.