Breathes typically work lower rhythms (think 20-24s/m), Drives typically work higher rhythms (think 26-34s/m) and Sweats are typically in between (24-30s/m). Higher rhythms require more energy to maintain, while lower rhythms take less energy to maintain.
Think about this: taking just 18 strokes in one minute compared to squeezing in 34 strokes in one minute. 34s/m is quick and can be tiring after a while. 18s/m gives you more time to lengthen out your stroke. However, it's important to note that a higher rhythm rate does not always correspond to a more intense workout. It more so depends on how much power is generated when pushing away from your screen during the drive phase. Your split is a reflection of your effort/power per stroke and we use our rhythm to help guide us there.
Therefore, you control your split with the power from your legs, rather than your rhythm rate. You can still pull very fast spilts at a low rhythm rate.
The key is to manipulate the ratio between the drive (as you push away from the monitor) and the recovery (as you come back towards the monitor). The more powerful your drive, the lower your split will become which indicates a faster speed. This means you need to take longer on the recovery to stay at the same rhythm rate. Here is a video that shows what this will look like on your Hydrow: https://youtu.be/Vm_l0Alqrvg
We recommend matching the hands of the athlete during the workout as this is the easiest way to stay in time.