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3. You are well on your way fitness wise.As for speedwork in general, for those of us who want to remain competitive some is necessary but we need to find a compromise. I warm up 20-30 minutes, including some dynamic stretching and for races and faster sessions a set of drills (A&B skips, butt kicks, and high knee running) and a set of pick ups at increasingly faster paces. Also include or start with 2-3 minutes at anaerobic threshold. I don't do a lot of stuff at mile pace or faster, but enough to get by. Usually these reps are at the end of a workout, but before I'm getting over-taxed. Most concerned about hamstrings, achilles, and plantar fascia. So it's pretty much tread lightly, old man.
I guess you gotta make sure you have a cake?
It may be time to rehabilitate your hamstrings with some weight lifting. The hamstring and quadriceps work together and if the hamstring isn't strong enough, it will pull.
The numbers I've seen are 70 per cent and two-thirds, so your references are resonable since there isn't a perfect number. At the advice of my orthopedic surgeon, I've spent the last year working on quadricep strength. I lift differently than the usual since I lift daily. I started with 30 pounds but I could feel some pulling on the inside of my knee (I've had knee surgery and tore something on the same knee on my last run). So I cut back to 27.5 pounds and that was borderline. I started with ten reps and increased the number of reps by feel, but usually after two weeks, up to 20 reps and then add weight and start at 10 reps again. Now I'm doing 15 reps with 35 pounds and it is easy. I also doing hamstring curls with 27.5 pounds
I tore my hamstring doing "flat out" sprints in 1964. In 1979, I had some problems with a tightening in the middle of my hamstring.The x-rays show scar tissue the length of my hamstring. The solution was to ice my hamstring and break up the scar tissue with massage (my wife did it). That worked and my hamstring problems went away; although I was no longer running sprints and sprinting at the end of a road race, isn't the same as pure sprints.