I was back on the bike 3 weeks after a triple. Very gently of course, just a couple miles, and was dragged onto it by my regular riding partner. 6 weeks later with new riser bars, and a new set of suspension forks to take the pain out of lumps in the trail, I did a 30miler off-road, but the heart rate never got above 130. The beta-blockers probably kept it low, but that ride made me realise that there was more to sitting around and stagnating. 9 weeks after the Bypass did a 50 miler on the road, and got the H.R.back up to 165 up a hill, but it rose to my Max of 172, whilst standing next to the ambulance, waiting for something to happen. Nothing did, so have kept riding ever since. That was 5 years ago, But Still ride with a Heart Monitor, and limit my upper HR to 165, for an age of 57. Limits don't count when other riders fall off on a technical climb, and only today saw 172 when the three 40 year olds I ride with got off and walked the last steep bit of the last hill.