GP as in doctor, not grandparent 
I'd like some perspective please as I'm struggling with this and a bit miffed.
Last week I walked into my gym (have been a full member for some considerable time) with my 12 week old baby (just wanted to pop my head in and had dc with me).
Straight away one of t he instructors came over, which was nice, thought they just wanted to see baby. So we start talking and I said I wanted to check the place out (has had a refit) before coming in the next day to start back with some exercise.
So they ask if it was a normal delivery and I say no, had a caesarean.
They seemed a bit confused about what exercises I could do (I'm not confused about this. Very confident about what's safe and working within my comfort levels) and suggested i speak to my GP. I tell them I've had my 6 week check and my GP is happy for me to start exercising.
At this point there's two of them (starting to feel a bit unwelcome and uncomfortable now) and I'm being asked to get a doctor's letter to say I can exercise.
This seems ridiculous to me. What do they imagine my doctor is going to say? To specify which bloody exercises I can and can't do?
And I'm 3 months postnatal. When do they stop trying to use a GP' time to cover their arses?
I did agree as frankly I felt embarrased and a bit intimidated but now I think it's a waste of my doctor's time (and mine frankly, it's hard enough trying to get the time to exercise with two small dcs and dh has limited time he can help out with them for this)
So aibu? Wwyd?
Help please wise women of mumsnet. I have a wobbly post baby body that needs sorting out.
Thanks
Em.