My own NSA update. Good progress!
Background: I'm 57, and have run for a number of decades. PRs I achieved when I was 20: 15:50, 26:06, 32:55, 55:26 (10 miles). Over the years, I've on occasion upped my training. Biggest blocks were marathon training in my 30's (2:57). Last year at age 56, I ran an 18:29 5k on a relatively fast course. But at my age, injuries inevitably creep in, and I've had the classic missed periods of running as I've had to recover. This had stymied progressing.
My mileage over the year prior to starting NSA varied between 30-44 mpw, subject to missing weeks due to injuries.
NSA: I came across NSA via a post on Reddit Advanced Running. I then inhaled this thread, which took several days. Immediately two things appealed to me: (1) Lower risk of injury, something appealing to us older runners. (2) Use of sub-threshold. I'd become a fan of Steve Magness's Science of Running, and he's big on use of threshold training. Sirpoc's sub T immediately made sense to me.
I began NSA on June 2 this year. I'd been upping my mileage in the weeks prior from low 40's to 50 mpw the week before. So I was doing higher mileage as I began NSA. After a bit of experimenting, I settled on these three sub T workouts each week: 4 x 2000, 8 x 1000, 5 x 1600, done on the track. I had been doing my distance runs in the low 8:00 to 7:45 per mile range. I immediately slowed to 9:15 per mile on the easy days.
The first 4 weeks were rough! The higher mileage and the three sub T workouts were really taxing. I had no interest in doing my easy days at a faster pace because I needed them slow. Leg fatigue was a real challenge.
Then at week 5, I noticed I was recovering from the sub T workouts much better. My easy day pace dropped to 8:40 or so, with the same low heart rate. I ran 58 miles that week.
Week 6, I got that sub T pacing bump I've seen others mention. In week 5 my 4 x 2000 workout was right around 8:03 per rep. In week 6, I found myself running 7:53 on the opening rep, and my heart rate was the same as before. On the 5 x 1600, my first rep was 6:11, and it felt about the same as the 6:17 I had done the week earlier.
Due to the missed training and injuries, I haven't raced often. My last race was a Turkey Trot in 2024.
5000 m race: In week 7, I had signed up for an evening track race, the Tracksmith Twilight 5000. My understanding is that the effects of NSA really take 3 or 4 months before you see meaningful benefit. But the improvement in pacing week 6 gave me some confidence. Based on various methods (including the Lactrace pacing calculator), I guessed I was around 18:00 shape.
My heat had an 18:00 pacer. I settled on how I was going to run it: stick to that pacer. The race itself was typical crowded track racing. There was bumping, I found myself boxed in and losing ground to the pacer. I busted out of the box and pushed up to run behind him, along with several other runners. We were just going round-and-round following this pacer.
We were 9 seconds behind 18:00 pace after 4000 m, so the job was to push hard on final K. I did, and ended up running 18:01. This is a personal best in my over 40 running career. NSA delivered, even early in my training cycle.
A couple post-race notes: In reading others' race reports here, I saw people describe the feeling like they were actually slow, and then being amazed at the times they ran. I never felt that way. It was all just keep pushing through, even as it got tougher the final 1600.
The speed (or lack thereof) aspect of NSA. My final 400 was a respectable 81 seconds to close. Relative to my fitness, that was OK. Looking at my 18:29 5k from last year, when I was doing hard 200's in my training, I also closed in 81 seconds.
NSA is working: better fitness, injury free. Looking forward to finding another race in a month or two.