Never stopped doing any of these. They're Legit staples in my routines, except for:

#4 Pushups- I mean if you can crank out 50+ reps of something its just way too light. Okay.. maybe as a warmup.
#7 Cross Chest DB Tricep Ext- Never did much for me. Prefer to lean over and do the one arm tri kicks with DB or cable. But Pushdowns, Close Grip Presses, & Skull Crushers are my Go To for Tri's ..finishing with Tricep Extensions.
#9 Sissy Squats - Tried em when I was younger.. never stuck to em. Prefer to build my thighs with extensions, Presses, Full squats, and/or Front squats & lunges.. In that order. No Sissy moves!
#10 Forearm rollers- Did these as a teen but by the time I was in my early 20's I didn't do em any more. Hammer Curls, Alternate DB Curls work great for me to get forearms Pumped