On checking out Pavel's beginning kettlebell video, he has a warmup where you hold the kettlebell close to your head and move it in circles around your face and head. It feels wonderful, really loosens up my neck and shoulders. edit: I find it works better doing it as a warm-down after doing pullups, or to relax me after a stressful day at work than an actual warmup or neck exercise...but I thought I'd throw this out there anyway in case anyone can get any benefit.