For the last 4-6 weeks or so..I have a really hard time getting my HR up to where it needs to be. I've hit a huge plateau and I've been doin cardio in the A.M. on top of PWO cardio. To get my HR to 70% of my max..I have to jog a pretty good pace on the treadmill and pretty much do a sprint on the elliptical. I'm not saying I have, just thats what it would take. I walk on a 7.0 incline at 3.5mph on the treadmill and I can only get it to 125bpm at the most. I do the elliptical at 65rpm and the most I can get it to is 120..Has anyone found anything that their able to continue to get their heart rate up to where it needs to be without running because I am out of ideas.