Is having one biscuit after a workout (blogilates) bad?

Hi so I have started having one biscuit after doing my blogilates workout, I eat healthy, 5 days of the week, with only a little bit of junk food, mainly it's fruit, and healthy oils used with cooking, cooking meat in the pan or oven. No deep fat frying. I eat quite healthy, the other two days (well one and a half actually) I have my treat night, which I know is bad, but celebrities do this as well and I eat healthy a lot of the time and workout. So is having a single biscuit after working out bad? I heard a little bit of sugar is good afterwards.