I don't know about working out my legs, but what I know is that, after wearing these (and I mean IMMEDIATELY) the heel spur pain that I have been suffering from for 2 years was GONE!!!!
I work in a hospital and am on my feet about 11 hours/day. By the end of the day, my heel used to be in so much pain, I was limping.
As I write this, I have just finished a stretch of 5 out of 6 12 hour days, and NO PAIN!!!
I recommend ordering 1/2 to 1 size larger. They don't come in wide, but one night with a shoe stretcher fixed any lateral toe pinch.
LOVE, LOVE, LOVE  these shoes!