cardio machines
For all my cardio indoor i use The Concept 2 machines. It gives me the opportunity to go down and out if i want or to do active recovery on the days that i need it. I tried a lot of rowing machines over the years but nothing can beat the Concept 2.
All 3 machines work every body part very effective, I wished they made the bike more like the Assault Bike, that would be even better.