Did my test again today, just about three weeks after the first one.
Standing long jump was 6'7" (it was 6'4" three weeks ago)
40m dash attempts were 6.18, 6.73, and failed to press the watch button at the end of the third. Last time my best was 6.70.
Vertical jump was 16.5" Three weeks ago it was 14"
It looks like improvement, though there's so much random fluctuation in my technique and imprecision in my measurements (esp. in the sprint) that I don't have a lot of faith in the numbers. Still, it's pleasant to imagine an upward trend. I'll have more confidence in my conclusions after another test, three or four weeks from now.
Here's the routine I've been doing about five times per week:
-One-armed pushups off a wall
-Inverted rows
-Planks with leg raises (facing all four directions)
-Goblet squats (body weight)
-Split squats (body weight)
-One-legged Romanian deadlifts (no weight)
-One-legged calf raises
-Shin flex with back against wall
-Verstegen stretch
-(My kids are too big for overhead carrying. I've found opportunities to carry them on my back, but they normally aren't yet awake when I do the routine. Haven't thought of an alternative yet.)
I started with 5 reps of each for a few days, then 6, then 7, then 8. None of this is close to maxing out, though I do notice a mental difference between 7 (which seems minimal and quick) and 8 (which seems to take forever and which makes me think sometimes that I don't have time for the routine). I figure I'll go back to 7 and stay there until I feel an urge to increase. The exception is that I've only worked up to three reps of the Verstegen stretch. After three (or even two) I have a strong sense of being done.
I do this routine in the morning before my run, and I've noticed that I don't feel as sluggish as I used to or take as long to get going once I start the run. On the other hand, the legs have perhaps felt a bit more tired overall. I have compensated by running workouts less often, waiting until I really feel like doing the next one. It's worked out to about once every five days. (They aren't killer workouts either, by the way.) The workouts themselves seem to be progressing nicely enough, so I don't think I'm losing anything by going less often.
I'm going to try the beginning level of the squat and deadlift exercises you recommend. I'm already doing single-legged calf raises as part of my warm-up, so perhaps I'll just leave it at that for now (unless you suggest otherwise). I may work on some chin-ups instead. As for the pistol squat, I find it hard to imagine every attaining the hamstring flexibility (in the non weight-bearing leg) to do it. But that one is a ways off in any case.
One question: is there anything wrong with doing the warmup routine, doing my run, and then doing the three strength exercises afterwards? That will probably be easiest for me logistically.
Feel free to criticize if I'm doing any of this wrong. I just wanted to give an update for your own info as you were so kind to offer such a detailed and practical routine. Thanks!
I wonder if anyone else has been experimenting with this. My report is: so far, so good.