Rock Running Explained

Simply put, this is an underwater breath training exercise for free diving. The weight, in this case, is an 80lb limestone rock. The persons feet are firmly on the ground, the weight counteracts your body's natural buoyancy underwater. This allows the person to train holding in more of their air for longer while on the bottom. The amount of energy it takes to run with the rock combined with the breath hold makes for a great workout. For obvious reasons it is important to only attempt this with a partner and to never try alone.