Did 20 mins jogging challenge---WOW, did that hurt! Jogged 1.21 miles in 20 mins, not too bad, but slow(3.6 mph). Then I walked until it got almost dark and I was really sore, for a total of 3.70 miles in 75 minutes(shooting for 5 miles for the other challenge(15 miles/week). Feel sore, but good! Burned 521.5 calories, not bad at all!