I've had the past little while off as vacation, and I've been trying to exercise more. Usually, I try and do 100 slow-rep pushups a day, and if I want to do more I might break out the dumbells and do some curls. Find push ups are easy to remember to do, and they are a great core workout. I've been at this for a while, so I can squeeze out sets of 30-40, so I'll usually do 3 of those a day. I started to do the slow-rep pushups when I found that regular speed pushups were becoming to aerobic and less muscular. The slow-reps allow me to really target an clench a specific muscle or group while I do the pushup (abs, chest, bicep, tricep, shoulder, back).
Also, I drink plenty of milk and water before and after pushups/workouts. I find that I am a pretty healthy guy for the most part, so whatever exercise I do is just to stay in shape. Once it gets cooler outside and I'm up earlier (for shool) I will probably start running again. As for progress, I've gained back the weight I lost while working all summer, and most of the weight I gained back is muscle I think, so I'm up from my dangerously low weight into a healthier range than before.