A beach jog can be a blast. It can also be way harder than it looks. In fact, running on sand means you’ll exert about 1.6 times as much energy as you would running on an even surface, according to the European Journal of Applied Physiology. The key to a good time might come in the path you take. Try starting on the hard sand then moving to the softer sand as you work up. A soft-sand run is more challenging due to the less-sure footing. It’ll work out more muscles (and slow you down quite a bit). The best method is getting the best of both worlds: Try 2 minutes on hard sand then 2 minutes on soft, and alternate throughout the run.