The basic principles behind rowing machines are simple: a set of two paddles, a pulley, and a chain, all connected by cables to a motor.
The motors are connected to a power source.
The power source is the water, which must be kept cold, and the pulley is used to pull the paddles forward and backward.
When the paddlers are not using the power source, the chain can be removed, so that they can pull themselves up and down.
This is how most modern rowing systems work.
And they’re not too complicated to build.
Here’s how to build a water-powered rowing platform for your own personal use.