All this brings me to the next couple of questions on the topic. First, what constitutes a Zone 2 workout? I know that sounds silly, but what percentage of time needs to be spent in the zone (50%, 75%, 85%, ...) to maximize benefits.
For me, when I "train easy" (Zone 2) it is 100% of the workout. So on Monday, Friday, and Saturdays my workouts are entirely in zone 2 up to 90 minutes in duration. Then, I add in more zone 1 or 2 work on Tuesday and Thursday either as a warm-up/cool-down or resting intervals (not walking but very slow running). In total, about 80% of the time I spend training is in zone 1 or 2 (maybe barely creeping into 3).
Second, I've always measured progress based on a combination of the average paces I've been able to achieve during training runs and races and the distance of my long runs/weekly mileage. How do you measure progress based on HR-based training?
I don't train by heart rate per se. The workouts I do cover a large range of paces. These paces also just happen to fall into heart rate zones. My effort guides my pacing similar to a heart rate zone workout. If the workout is at 40 degrees vs 100 degrees the pace will likely be different. But my goal is to give the same effort at 100 as I do at 40. That means my pace will likely be slower at 100. With that being said, when my heart rate monitor was working I was tracking it versus paces to see my improvement. This is how I did it.
I plotted the pace of the run versus the average heart rate. I usually chose a few miles in the middle of the run to average together. These runs were done at similar elevation, similar temperature, and a similar route. It allowed me to measure my progress over time. As you can see, Pre-Hansons (when I trained hard all the time) has a higher heart rate for paces than Hansons (slowed down training and bumped to 6x/week). So a similar condition run was taking less beats per minute by my heart which meant I was getting stronger and fitter. Look at a 10:20 min/mile for example, Pre-Hansons that was a 144 bpm and during Hansons it dropped to 120-128. That's a big difference and constitutes actually doing more zone 2 type workouts. I should have been running much slower during my Pre-Hanson training.
The line of best fit was a means by which I was attempting to create a personal race predictor calculator. It worked really well. For my October marathon, my PR was 4:20, I trained for a 3:45, and my half PR suggested a 3:45, but my HR calculator predicted 3:39. I ended up running a 3:38.
The paces I choose to train at are based on my current fitness (either a recent PR, or for this next personal cycle what I felt would have been my PR given ideal conditions) and then I input them into a training pace calculator (like the one I broke down into decimals from Hansons). When choosing how to run in a training cycle I first choose the paces and then the duration of each day. This means that mileage is just a function of intensity X duration, and mileage is not a factor in choosing what I run each day. Here are two journal entires (
1 and
2) on how I create a custom training plan. I believe the methods on how I choose to train are relatable to just about anyone.