Thanks for the replies everyone. I've since returned to walking to stay within the 50-70% MHR. I've been tweaking the treadmill settings by adjusting the elevation and increasing the speed and when my heart rate passes the 70% threshold I reduce the incline. I've been doing my 30m sessions at around...

Hey guys a little background. I'm 32 years old, 6'5", ~240lbs and I haven't worked out in 7 years or so. I'm not getting any younger and a lot of people in my family have had heart attacks. I want to get back in shape and I'm interested in getting my heart healthy. I bought TB2 and S&S and ...