I've been taking my resting heart rate every morning that I have a training day planned because Joe Friel told me to. Normal resting heart rate for me is around 41-42, and that's during a training week. If I haven't ridden the bike in a week it'll go down to 39. Today, it was up around 46 because I went for a massive ride 2 days ago, rested yesterday. Then today I found I just didn't have the legs to do 2x20's.
I take it every morning when I wake up - I turn off the alarm, stare at the ceiling for a minute or two while I clear the fog, then take count. I can kinda feel when it's going to be higher than normal, and I took note when I saw it was 46 that I might not be able to do the workout planned. Sure enough, out on the road when I started the first interval, my HR on screen was SUPER sluggish to respond, and I felt like I had dead legs, like I was doing a 3-4 minute V02max interval instead of an SST/Z4 interval. I ended up riding Z1/Z2 for an hour and called it a day.
Anyone else use RHR for anything? Any tips/tricks/wisdom to share?