Even if it could show up - it wouldn't, sorry Kirsty. An hour's strenuous exercise might burn 400-500 calories, absolute tops - and probably a lot fewer calories than that.
Unfortunately, you need to burn 3,500 calories to shed a pound in weight. So that would be 5-6 straight hours of strenuous exercise.
And even then, that pound that you'd burned off might not show up at the scales because your muscles and joints would probably retain water (to repair damaged muscles). In fact, it's actually quite likely that all that exercise would make it appear that you'd gained weight (even though it would only be water retention.
You know... IMHO, if I were you, I'd steer clear of strenuous exercise for now. If I remember rightly from your other posts, you've got a fair bit to lose and you're only in your first week. All that's likely to happen is that you'll get hungry and end up eating. Once you've been on SS for a couple of weeks, it's fine to do some exercise, but it's probably best to build up gently. Do some walking, swimming - things that aren't quite so tough on your body.
And yes

stop jumping on those scales! If you do the diet 100%, you cannot fail to shed fat, okay? :hug99: