i do 3 sets 6-8 reps apiece. lying DB ext. i use 35 lbs. Skulll crushers i'm still trying to find a max for but i usually go at it with a 70 barbell. full body dips i can do 25 reps. about 10 a set if i hook up the chain with a 45 plate.seated tricep ext i use a single 75 lb DB. single arm tricep ext i use a 25 lb DB. And yes i do use all of these exercises in a single tri work out.i think that i might be trying to push to much into a work out.but i want to get the size. right now i'm 5'10" 164 lbs.