Susan hates being unable to move around with the painless flexibility that she enjoyed in previous decades. This was particularly evident after assisting her friend Sharon to hump a four hundred pound piece of office equipment to her storage unit. Susan bends with her knees, not with her back, just like her old man has been advising her to do since she was eighteen. Back then she ignored him, but now she embraces his wisdom because she's a worn out middle-ager.
Oh, and on Day Ten Susan gave in and turned on the heat.