I am training extremely low volume.
Progressive overload has brought me only small injures, discomfort and discovering how much strength I could activate (but not really increase, since there is no muscle gain).
Every day or every other day, smth like: 1 set of pullups, 1 dips, 1 abb wheel roller, delt raises (more than 1 set), eventually something for neck and forearms.
Stopped doing biceps/ triceps isolation and dumbell shoulder press (on inclined bench).
Pullup/ dips feels much better, small weight delt raises as well.
Have to admit I skip squats now, which in home setting is light weight (~60 kilo), but I have to clean and overhead push the weight to set me up for a back squat.
Main training goal to become better at pullups.
Another one - to pump (pimp) up my shoulders 
I got annoying brachioradialis injury for more than 3 months, now just do a set of 6 pullups (I can do 9-10). My best was 13-14 in a row ~10 years ago.
Dips with accent on triceps, I just do ~15. Previous max of mby 40 in a row (inclined).
I guess I should allready start doing weighted dips, but I HATE feeling any strain in joints and tendons 
‘Squat’ - the bottle neck is the overhead push, even if it is driven by legs (not clean). I guess the max I could achieve is 80 kg.
Once again, I don’t want any injuries.
A week ago I got a mild injury from… stupid shrugs with 60 kg, as I grabbed it without warmup. Somewhere in the lower back/ ilium, whatever…
And I do have some injury on the lower back, have had accidents from physical work and bad deadlift form (PR 160 kg).
So how much volume/ progression is too much?
I do not want ANY joint and tendons discomfort, I just want to train regularly for years to come.
Doin’ these sully 1 set pull up and dips is low load, I feel my arms (biceps triceps) itching and tickling every other day, no soreness and joint/ tendon strain, not pushing for higher numbers.