Changing your routine shocks your muscles and prevents adaption...which I need because as a runner I gravitate to the treadmill. Today I took on the elliptical! (I think the elliptical one - but tomorrow’s another day!) http://liketk.it/2zRyA liketkit LTKfit LTKstyletip LTKunder100 LTKunder50 @liketoknow.it