I always feel crappy for several hours after strenuous exercise - all shakey etc. and it's rather offputting.
Today I went swimming for 45 min at noon - felt shite afterwards so had an apple at 2pm (skipped lunch due to lack of time but had had breakfast at 8 and chocolate bar at 10:30).
Had cereal bar when I got home at 4 and still feeling rubbish and now still feel shakey after a bit more chocolate and fruit.
(sorry, rather boring breakdown of food intake there)
It makes me not want to bother exercising...