I used to swim competitively in high school, but has not gone into a pool for the last 3 years (burnout and boredom). I'd like to tone my upper body (a little flabby). Besides situps and pushups, what sort of exercises can I do at home on my own?

I work 10-12 hours most weeks so have little time for anything else (my running is the one that I can squeeze in since I can do it practically anywhere with a pair of shoes, shorts and running top).

Appreciate any advice that I can get. Not looking into muscles, just a toned arms, upper body etc.

Thanks.