I’d suggest curious folks review some rowing technique videos.
They have a deeper, fuller utilisation of the glutei at a much higher resistance for enough reps at long enough intervals to put a much higher net load across all of the systems: aerobic, anaerobic, psychological. The psychological stresses are not to be underestimated because it’s even more boring than cycling IMHO.
It’s hilarious running with rowers though because they generally have a long bouncy strides at low stride rates. It feels like gliding alongside someone walking/bouncing on the moon.