The context of the following conversation is Taylor took it easy even though he had a big track meet coming up next week.:
Taylor says I can't do that hike with you tomorrow..
The friend responds How come?.
Taylor responds I have a big track meet next week and have to save my legs, I'm going to take it easy..
The friend responds You're not going to work out until then?.
Taylor responds Oh, sure, but hard hiking uses your muscles differently..
The friend responds I didn't know that..