Leo Frincu is a world champion in wrestling and he is Ronda Rousey's strength and conditioning coach. Below is a video of Leo performing up hill drills in sand. I wrote previous articles about hill sprints and training in the sand. To find my previous articles please click links below.
Hill Sprints:King of All Workouts
Super Charge Your Hill Sprint Workouts
Check Out Lew Funcu's Sand Dune Training in Malibu, CA: