I had purchased a FAT TIRE mountain bike from Costco for my birthday and I took it on a 30 mile plus trail ride for a bit over 3 hours. In the afternoon I took a power walk for 4.7 miles in 90 degree heat (felt good) I use a polar H7 chest strap when I am working out as I find my Apple Watch HR cannot keep up on the bike (the banging around seems to break the connection)