The Gymbo Pro Water Resistance Rowing Machine utilises a water resistance system to simulate the feeling of rowing on water as closely as possible, no flat spots on your stroke & the soothing noise of water being churned as you work out. The height adjustable computer means that you can keep track of your workout & If a relaxing day rowing down a river is not for you then there is a tablet / phone holder to help keep you entertained. Time, strokes per minute, distance, calories, & stroke total are all displayed, the computer is powered by 2 AAA batteries (included) so there are no limitations to where you can use the rower. The resistance is created by the user’s efforts, & this can be fine-tuned by adjusting the water level between 12 & 18 litres. The harder & quicker you row the more effort that is required to pull the blades / paddles through the water tank. The rowing handle is soft & comfortable, the footrests are angled for the optimum rowing position & the easy to use