Krachtbox is the first outdoor gym in Haarlem. If you are an outdoors lover, you should definitely try a workout here. The workouts at Krachtbox are challenging because the trainers really ask you to break your own boundaries. But they’re also fun! With workouts like Box, strength or Bootcamp, in which you use your own body weight and extra’s, their schedule never gets boring. If you’re looking for an outdoor thrill with simple but effective workouts, this is your spot!