I bought a Groupon for 10 kickboxing classes last May and I decided I should use them before they expired. iLoveKickboxing has a location down the block from my office and I registered for the 7:30 PM class.
The bag work was my favorite. We alternated holding onto the bag while our partners performed punches, front kicks, and side kicks. FYI, it hurts to stand on a semi-broken toe while kicking with the other leg. We finished up with push-ups and crunches.
I ended up being talked into buying a 35 class card that allegedly never expires. I didn't really want to spend the money, but I was able to save $150 so I think it was a sensible purchase.
This iLoveKickboxing location does not have a shower so it's definitely a post-work activity.