Today i was too weak to squat a 3RM of 150kg (got 3x147.5kg yesterday) and im prob gonna put it down to the hard run this morning eating into my performance. However the funny thing is i was able to progress my 10rm just fine, getting 10x130kg which is a lifetime PR (and the 127.5kg was the same yesterday and so on forth). Plug in the 1rm calculator app on my phone and it says i shud have a 172.5kg max - lol yea alright, that's why i racked 150kg after the first rep cos i didn't think i would get a clean 2nd leave alone a 3rd. So what's going on? It's just the same thing we've been talking about -- the illusion of progress / productive training by doing something easier just to say you're making progress even tho there is almost zero translation between longer sets and runs to shorter more intense ones. I buy in to the longer rep sets though, cos it's nice to make progress regularly even if it's just fools gold to take it for anything other than what it is. something holistic would just make regular PRs as part of training and the problem with longer runs (and being specific here duration) just runs into the same problem that as you increase speed it becomes harder, so where is the progress?
For the squat if you have a theoretical max of 172.5kg based on 130kgx10 reps but struggle with 150kg it's probably because you're not used to lifting the heavier weight. Your body adapts to what you train it at. If you started practicing heavy singles and also worked on doing half squats with 200+kg to get used to the weight on your back I wouldn't be surprised if you came close to 172.5kg in a couple of months. However, in rare circumstances you might be an anomaly where you're just great at being able to push out 10 reps. When I first started lifting I was mentored by one of my mum's friends who was a bodybuilder. He could easily rep out 12 reps of 120kg on bench but would struggle with benching anything 140kg+ because he was used to doing 8-20 reps with short rests (<1 minute) between sets.
Edit- Congrats on the
. As for running I think you should just experiment and do what you think is best. If your goal is to run 5km in sub 20 then get used to running for 20 minutes and keep increasing the speed.
To run 5km in 20 minutes or less you need to be running at 15km/h (4:00 minute 1km speed).
https://www.depicus.com/swim-bike-run/pace-conversion-chartAtm you can't run that fast so start off running at 10km/h for 20 minute.
The next session try running at 10.3, 10.6, 10.9 etc. If the 0.3 intervals are too much reduce it down to 0.2 or even 0.1. Once you stall you can start doing other things like adarqui suggested e.g. speed work and longer runs.
Just my opinion (I have no distance running experience!!!).