The way you can tell Shepard didn't arrange the shuttle? No gym. She hasn't let that slow her down--you can do push-ups anywhere, and you can make a cardio workout of it if you're determined and physically strong enough. She's both.

When York sticks his head in to say hi, she doesn't stop or even slow down, banging out the reps like she's 18 and in boot again. Of course, when she was 18 and in boot, she didn't have extensive cybernetics, but she figures she's earned the power boost by now.

"Hey, York. What's up?" They can chat. She'd have to be going a lot harder to be too winded to talk.