Cardio

I love the routine I have for functional strength training. I've been working with my trainer for years now. When I met her she referred to her "boyfriend", and it was a big deal when she moved in with him (in his parents' house). Now, they are married, own their own house, and have a three year old! Adorably, the three year old is often on the other end of the video call, and she sometimes copies my movements. I love the movements, the strain on my muscles, the stretching and moving in every direction. I work out on my own between our twice-a-week sessions, but for my trainer I work harder than I do on my own. So this is a success, and I won't tamper with it.

But I need to work my heart harder, according to my doctor. I need cardio! She gave me specific targets of time and effort: twenty minutes of high intensity exercise five times a week!

I have not enjoyed high intensity exercise for a few years. I used to love it! My first brush with using machines, the basement Nordic Track, was the first time I consciously felt how good the body feels during and after working hard. It can be exhilarating! I believe the machine got me to a high enough cardio fitness level that finally I could start running. And I loved running! No, not every day, and not ever for the first 10 minutes. But the way it made my body feel was great! 

I was an early adopter of a heart rate monitor, back in 1998. I'd read about appropriate training intensities, and here was a gadget to help! My first one had a chest strap and a watch that displayed time, heart rate, and elapsed time. Nothing else- GPS hadn't downsized to live on wrists yet, and phones were flips that couldn't even text. I propped the watch up on the Nordic Trak so I could see it all the time. I learned that perceived effort each day did not tie to heart rate - I could feel like I was pushing myself to the limit, but some days the ol' heart just didn't want to pump fast. Interestingly (to me, any way) the day before I got sick was always a day the heart was sluggish.

I also learned that walking didn't get the heart rate up high enough to be in the high intensity zone. Nordic Track, swinging my arms in time to my legs, quickly did raise the rate. A walk has many benefits, but I cannot hustle enough to accelerate the pumping of my heart. Only uphill - which in the absence of a mountain to climb, is always going to be brief - begins to approach my target zone. My first tentative jogging steps taught me there is no comparison to walking - my heart got excited and pumped away! The mechanics of walking and running are really distinct from each other (jogging is simply slow running - no technical difference). I might be a slow AF runner, with young men passing me while walking, but the cardio benefits are real even at my pace.

When I stopped running, I stopped ever exercising in that intense zone. The last year I ran anything more than a token amount was 2019. My Nordic Track had long been retired, in a dusty heap in a corner of the basement. I still did small amounts of cardio on the machines in the gym, but that all came to an end in March 2020. 

But now I have machines galore! My BIL lent me (effectively gave me) his long-unused stationary bike. I bought a rowing machine in January 2023, and used it a lot the first couple of months, and only intermittently afterwards. I started up again this autumn, since I started on this cardio bout, and also because now I have a friend who is also starting to row. I have a mini-trampoline, which I use to bounce a bit in front of the TV. But on the tramp, I can't get going enough to get the heart rate high - my balance isn't what it was, and so I don't have the exuberance I used to, not getting a lot of air on the bounces.

Detailed stuff about heart rate:

When I first started using the heart rate monitor, I used the classic formula for maximum heart rate: 220 minus your age in years. So I was about 45, and my max heart rate was calculated to be about 175. There is a formula more accurate for old people, seventy percent of your age subtracted from 208 (208-(age*.7)). The two formulas give the same answer for age 40 and from then on the "208" formula gives a higher number as your max heart rate, and is said to be more generally accurate.

The reason for knowing your max heart rate is to be able to calculate training intensities. Cardio benefits really kick in at the higher intensities, 75-85% of max. Fat burning benefits kick in at somewhat lower intensities, 65-75% of max. 

But here's a wrinkle I only just learned - biking (an exercise that doesn't use your arms) will lead to lower heart rates than running (a whole-body exercise), but can yield big benefits at a lower number. Who knew? 

But I found that even though I was working very hard on the rowing machine, my heart rate (on the Apple Watch) was consistently lower than on the bike! I was confused, because the rower certainly uses my whole body. Was it a measurement error from the watch? I googled "why is my heart rate so low on a rowing machine" and found links into Reddit, where this very question was being addressed by the helpful nerds who hang out there. Basically, they said we must be using the wrong technique. We must be using our back and shoulders more than our legs, which is inefficient.

So here's the rowing technique tips in english: the first part of the motion is pushing back explosively with your legs. During that, your hands and arms are just along for the ride, with your legs doing the work to pull the bar you are holding. Only after your legs are fully extended should you lean back, and in the final part of the stroke use your arms to pull the bar up to your chest. The return is rest, no effort expended. And, do not try to go faster by returning faster! That should stay the same, a passive ride, until the legs are bent and you can explode back again. The faster you push back, the more strokes per minute. But strokes per minute doesn't need to get too fast; instead, raise the resistance.

So I tried that one morning, and the difference in my heart rate was signficant! I went up to a higher zone quickly, and stayed there the whole time. And felt my whole body aerobicized afterwards, a great feeling! It feels like a break through!