How hard are we really working out? There are a bunch of ways to tell. Today I’m going to talk about objective measurements and tomorrow the subjective ones.
When we’re doing cardio, we want to check in with our heart rate. In these days of smart watches and fitness trackers, that’s pretty easy: we just look down. But what does the number mean? (Sorry, there’s about to be some arithmetic.) The easiest way to calculate a person’s max heart rate is to subtract their age from 220. Then we calculate the cardio range as 65 to 85% of that number. Let me use myself as an example. I am 57, so my max heart rate is 163. The bottom of my cardio range is 65% of 163, or 106 (rounded up from 105.95). The top of my range is 139 (rounded up from 138.55). If I glance down and I’m not even hitting 100 on the heart rate, I need to kick it up a notch. (I worry a lot less about the top end of things. Most people feel terrible and slow down automatically when they get past 85%.
The rest of the objective measures are less immediate. HRV, for example, is something we need to benchmark before we use because it is a highly individual measurement. In other words, we don’t want to compare our HRV with anybody else’s. Our trackers/smart watches measure this for us and can give us an average over a week or month or longer. In general, a higher number is better. If we see that our trend is improving over time, we’re working hard enough.
When the number on the scale is not moving, it is not necessarily time to panic. We can check our body fat percentage with a handheld gizmo and see if that number is changing over time (Lower body fat percentage is better, to a point. Feel concerned if it is below about 10%.). We may be adding muscle, which weighs more than fat, so the number on the scale will stay the same even as we change our body composition.
Finally, we can look at our workout sheets. If the number of reps we are completing and/or the weights we’re using are getting larger, we’re doing things right.
Go play.