Check out Kelly Starrett on youtube for proper form instruction wrt pushups and pullups. Good form is important even when less wt./higher reps are involved.
“Some ideas are so stupid that only intellectuals believe them.” ― G. Orwell
"Why can't men kill big game with the same cartridges women and kids use?" _Eileen Clarke
"Unjust authority confers no obligation of obedience." - Alexander Hamilton
