I have been slacking a little since my neck got injured, however I am wondering anyone know the effectiveness of high rep low weight work outs? I see ripped guys doing this all the time; looks like they are getting a massive pump... I know my lactic acid shoots up like mad when I go much higher rep lower weight. My arms weren't getting sore at all no matter what, then I decided to try this, so I dropped the weight to like 50-60lb on the curl and did like up to 25 reps 4x sets, well the next two days my arms were finally sore. Should I be mixing it up more often?