will 70lbs for sets of 4 by 20 reps be enough to grow my neck to 17"? training it 3x a week both curls and extensions. i heard that workload isn't always the same in example 225lbs x 5 isn't = to 135lbs 15 reps for 3 sets. is this the same for neck training? i want to build strength and mass. i'm also 5'6 140 lbs planning to bulk.