Keeping hand weights at my desk helps me to squeeze in time for toning arms and upper body. I take two 15 minutes at work and I get up from my desk and use the weights to work my tris, bis, shoulders and upper back. I got funny looks at first and then my co-worker joined me and now it's become a normal practice.
I started with 1lb weights during physical therapy for a wrist injury and then moved on to 3 and 5lb weights for arms and upper body. I do high reps and 3-4 sets, not enough to really make me sore but enough to get the blood flowing and make up for any missed workouts. I feel really recharged also