When I started it was more of a walk (2.0 mph; 30 minutes), but it still wore me out.

Now, I do a 7min mile on Wednesdays, try to get my 5k @ 2% incline down to 28 minutes on Satruday (did ~32 minutes yesterday), and try to get a 10k in under the “club limit” of 1hr on the treadmill on Sunday (did 6.15 mi. in 1:02:00 [2 minute cooldown] today).

It’s the best way to get my recommended weekly cardio I’ve found.