Good
Apparenty, a typical Boxing conditioning is: 30 pushups, followed by 30 clap push ups, followed by 30 finger pushups, followed by squats, and other things. It will leave a fairly lazy guy blown away even before the punching starts.
Compare that to Taekwondo conditioning: 30 pushups, followed by 20 pushups, followed by 10 pushups (I can't even do that fully, they do it too fast, and once my breathing get's heavy I have to slow down, followed by 50 situps. Countless stomach exercises lift your legs up to the air and down - maybe 75 times, holding on to something in the back, in a sitting position. The last exercise is very annyoing but manageable.
I would get blown away in a Boxing Class.