Ok I've heard a bunch of theories on this but before I continue please explain what exactly you mean by feeder workouts? To make sure I'm on the same page....
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Feeder Workouts are basically 3 Sets of 50 to 100 Reps.
The following day after doing any Muscle, that you want to promote growth for.
So lets say you did an Arm Workout.
The next day you would do 3 Sets of 50 to 100 Reps for Biceps.
The Variance is doing 6 Sets of 50 reps
Feeder Workouts can be done on Workout Days or Rest Days.
I've even seen where it's done Every Night for a Month Straight to bring up a lagging body part.............. JP
P.S.
I do a Variance called Century Sets, it all revolves around 100 ~ 100 Reps/100 Seconds.
Where you are going for 100 reps.
You do as many as, so if you do 50 Reps, then rest 50 Seconds.
Do as many more reps as possible, add those to the 50 reps done, Subtract from 100, that's your rest.
Continue like this until you get to 100 reps in total.
Rest 2 minutes, move on to the next set.
For a Total of 6 Sets in all.