For pure strength in power lifting moves.
Bench press, you can put the max weight for 1 rep on the bar. The lifter lowers the weight and the partner helps lift it back up.
A 1 rep max weight could usually be done 4-5 reps. So an example of something that would put major strength on your bench would be to do a regular strength routine then add 3 -4 sets of negative only reps as follows
Set 1 is you max weight for 3 reps. Remember you are only lowering the weight and your partner is helping you push it back up all three times
Set 2 is same as above but do 4 reps. Remember you partner will have to be doing more work each time, ( good workout for him to get his lats bigger 🙂 )
Set 3 this time you go to your max, keep lowering the weight til you can’t lower it anymore, this can be very dangerous so I recommend three spotters.
If you have questions it may be best to give me a call to clarify, this stuff should only be attempted by someone with a bare min. of 1 year experience of consistent workout. Really only needed after every other workout isn’t helping anymore.