I picked up a C2 earlier in the year and recently completed the Pete's 5k Training Plan ("lighter" version) for off-court training over the summer. Here are some observations and questions from the experience.
Personal stats
42 M / 155 lbs (70kg) / 5'7" (170cm)
First time rower
Longtime squash player (intermediate, ~3 days per week)
Beginning
Like most newbies, I found Pete's Beginner Program and embarked on that plan. I repeated the first few weeks, hoping to learn reasonable technique and adapt to the exercise. After a few sessions, I noticed that my technique would break down on the 5k days, while the interval days gave me a little bit of recovery time to reset and keep it on track.
Some more reading lead me to Pete's 5k Training Plan, specifically the "lighter" version suggested at the bottom. This plan provided a) more interval work, and b) less distance since it divides it in half. I changed plans and wrote off the initial weeks as just a warm up.
Heart Rate Zones
While researching technique and training plans, of course I came across a LOT of talk about zone training. Frankly, it seems that there are way too many opinions out there that I could spend a lifetime reading.

* the ErgZone app displays heart rate % and color codes it in 10% intervals
* the 5k plan offers three sessions types: 1) short duration intervals, 2) longer duration intervals, and 3) a steady distance
* I gave each session type it's own 10% interval: 50-60% for the long distance, 60-70% for longer intervals, and 80%+ for short intervals
With the H10 I measured my waking resting heart rate a few times at 46 bpm. I did not know my maximum heart rate, so I used the ballpark (220-age) calculation, 180bpm. FWIW, over the course of the program, my phone reported a maximum observed heart rate of 169. I think it could go a bit higher, but not on the erg (yet).
Anyway, I wasn't too concerned about zone accuracy as this was my first experience with zone training, and I felt that the target zones I picked would be discrete enough to feel the difference between them.
Schedule
Week four presented some scheduling problems that kept me away from the erg. It was nice to take a week off and see how the body was settling in. I incorporated some stretching and had a better idea of which muscles were sore (lower lats), a little achy (gluts), or keeping up and ready for more (quads, hamstrings, calves). Over the course of the program's twelve weeks, I'd take a few days (5-7 days) every three weeks and repeat the rest / stretch eval. The plan was organized in 3 week intervals, so this worked out well.
The last two weeks of the program started overlapping the squash season and I slacked a bit on completing them. I used the erg sessions to supplement my squash days, trying to distribute the tougher and easier days from each sport. Those took about 2 weeks each to complete. In retrospect, I'll just call it a taper.

Future
Congrats if you've read this far. Overall I found the cross-training a great experience. If I were to run through this type of program again, I'd do a few things differently:
- Plug in a lower maximum heart rate
- Pay closer attention to pacing: I burned out on some of the short intervals. Maintaining heart rate on the longer intervals and steady distance was also a different kind of challenge.
- Drag factor: I settled on ~100 early on as it "felt right", but I didn't bother measuring to verify
- SPM: similar to drag factor, I left this to whatever "felt right" for the session type
The Data
Here is a spreadsheet of some of the interesting metrics collected over the the course of the program. Unfortunately I experienced a few bluetooth glitches, for those I put down "--" placeholders. Other sessions my heart rate seemed off, either too low or too high compared to previous examples. These I marked in italics. The 500m times aren't anything to brag about, but at least they marginally improved as distance and interval increased. I can add any other ErgZone or ErgData collected metric if anyone is interested.
