Workout quesition

[WeezyBengal]

(02-05-2016, 11:12 AM)Au165 Wrote: Is six the number because the amount of weight only allows you to do 6, or is it an arbitrary number you just chose?

Its pretty much a number I chose. 

Im really struggling trying to decide my rep ranges and when to go until failure etc. 

My ultimate goal is to put on some muscle mass. 

I am thinking of increasing my rep range to 8-10 reps to promote muscle hypertrophy.