For me it'd have to be lower back pumps.
I did a 1gram frontload this week of test enanthate- last day of week 1 right now, and i already have some back pumps... even though i dont feel particularly horny or everything.
Looking for personal experiences here, should be good for newbies to read about:
What is the first effect you notice when on a long acting test?
And about what week do you notice it?
Post up- could be interesting.