I was watching the videos before I received the trainer on 11/22, so I trained almost the whole week, just basic endurance, and then on the weekend, I sprinted then endurance. A swell came, and we've been having waves since Monday. I've been able to go surf every day cause I don't have too much work this week, and I'm surprised I don't feel my arms fatigued or heavy. Yesterday I surfed for almost 4 hrs and I went again today ☺️ and going tomorrow with God's favor. Probably by the next week I will be able to record my practice. Great product ☝🏼🙏🏼 ⭐️🙌🏼⭐️🌊