Cardio in the gym for me today, 25 mins of intervals on the self-propelled treadmill, then 25 at a steady aerobic pace on the bike.
I'm starting to like the self-propelled treadmill. Ours are shaped like a banana, and if you set the resistance high and get right up on the front, it's pretty steep and you can mimic going up a steep slope on the balls of your feet, gets a good load on the calf muscles.
Of course, nothing is as good as the real thing, but it's pretty good, and you can't do that on a stair machine.
