My new exercise machine. Fat bike! ... but I cheat. <G> It's an eBike, so I can either peddle along OR get several levels of power assist with a click of a button. I went almost 20 miles the other day, peddling in the flats and using the assist up hills where my knees would start to bark. Kept peddling, but clicked in enough assist to maintain the same effort level I put in on the flats. Still ended up getting more exercise than I'd get on the standard mountain bike because I didn't wimp out as fast.