my very young 20yrs and healthy but not fit step daughter had a go last week and i was furious they put her straight on with an 8kg one and she's still aching and has a pain in her arm , they didn't do any kind of health check and i'm sure if i'd turned up they would've just let me have a go and i'm 6 weeks post op gggrrr
well done you though because you seem to know what you're doing and being sensible