I just had Pilates class. First time ever. I'm a long / thin and my body type is kind that is basically impossible to build muscle. However, I'm pretty fit, walk everywhere and have a very physical job where I won't sit down for at least 8 hours. So after the class the instructor tells me I am very weak and do I have a desk job? I say no quite the contrary I have a very physical job. So she keeps saying it wow you have very little back strength & such bad posture! Do you spend all day crouched over then? Er no.. Bit disheartened by it all! I'm no bodybuilder but assumed I could hold my own! So AIBU? Bitchy or giving me advice?