On weight, as long as I run enough, I can keep it down to what it was when I was running my fastest, about 35 years ago.
Then was 5' 9" and 148 lb. which is heavier side for mid-distance. Probably why I declined steadily at distances once they got past 3000m.
Did get slightly lighter when running in hot and humid Mississippi a a few years back, when training for a 10k. It might have helped as I age graded at 85.11% which was a surprise considering how ordinary I was over that distance as an open runner.
I'd like to get down to 145/146 on the basis that if I've got less muscle, then I should be lighter!
Been gradually trying to work my way back into some better running over the last few weeks. Had a sore spot on the inside of an ankle - something I'd never had before - but wasn't interfering with running until I did 8 at 7:22 average about 5 weeks ago, and then had to walk downstairs backwards the next day.
Turned out to be posterior tibial tendonits, which I'd never suffered from or heard of before. Probably down to calf atrophy - when I went to the physio, it turned out I had no knee reflex on that side. Anyway, 5 weeks of laser have been making an impact, and it's a lot, lot better. Some work on the left back/hip got the reflex back, and I think some improvement in calf strength.
Have managed to keep running, but the back of the right leg had been tightening up in protest to the extra work it has been doing.
Finally getting somewhere, I think, after five weeks of running most days, but very moderately. Managed four miles at 7:30 yesterday.
When I'm right I'm trying to do 5 miles x 5 times per week steady (7:30 +/1 10 secs), 1 quality session, and 1 longer run of 60 min or plus. Maybe working up to the odd 90-100 min if I go slow on trails.
One thing I do find odd - maybe as a function of being more a speed runner - is that it relatively to longer paces, my steady runs are way quick (compared to say half-marathon pace - I'd say that my steady run is faster than I could run for a half-marathon - when young, my marathon pace was about 1:15 per mile outside my 10k pace). Even at that, though, according to my Garmin, at 7:30-7:40 I'm only averaging 123-125 heart rate, and it's telling me that I've done a 'maintaining' effort. A three mile tempo at 6:50 per mile in the middle of 6 mile run, only got into the mid-140s (I'm reckoning on a max of 165 - it was 175 about 8 years ago, so that seems conservative).
Anyway, it seems I'm locked into having run at a pretty high intensity to get much cardio-vascular upside. Maybe it's the result of 45 years of mostly fairly intense stuff (used to run either 2 track session and a race, or 3 track sessions a week in the track season until my mid-30s where I dialed it back to 2 hard sessions a week).