Mine, being 37, is 183. Again, more or less. And then you want to be around 70 percent of it.65 percent to 75 percent of it for moderate effective benefit of exercise.And to keep in mind that the quantity does affect quality.And once again we have the graph that we see so often: the curve linear relationship.So if on this side of the graph, we had psychological plus physiological benefit,and here we have effort or amount of work, the graph looks like this, where too little effort is not good.We are compromising on our base level of happiness. Too much effort is also not good.That's when we experience the staleness and the anxiety.And what we want to get to is more or less around our optimum level.And also optimum level given how much time we have.Yeah, in an ideal world, I would work out six times a week for one hour each time.In an ideal world. But I want to do many other things.So I exercise at least 4 times a week, 30 minutes each time.It's good enough for me. Identify what's good enough for you.Recovery is important. We talked about recovery on the psychological level.Recovery is very important. Let me share with you just a quick story about Derek Clayton.Derek Clayton was a runner in the early 60s, one of the best long distance runners in the world.