I make sure and get my chin-ups in whenever I'm at the gym, besides whatever else I do in my classes. Lately I've been using the assist machine - first set just 20 lbs of assist so I can get more reps with a shoulder-width underhand grip, then another set with 50 lbs of assist, wide overhand grip.

I need to at least do a few unassisted to keep tabs on whether I'm progressing at all. Haven't in weeks.