HarryFatter

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You'll need a device called a "caliper." Or you could get a weighing scale that measures body fat in addition to weight.

+1 I recently compared my indoor (treadmill) and outdoor run times and I was very surprised to learn that I actually run faster and farther outside than on a treadmill. I'm not sure why though -- could be because outside I can pound the ground as hard as I could or the beautiful scenery outside. Good luck!