Having strong glutes (not the same as a fat arse) is really important for everyday life, preventing injury and protecting yourself through ageing. They help stabilise the pelvis, provide propulsion to movement, provide stability, improve posture.
They’re the biggest muscles in the body and often become weak and shortened through our sedentary lives and lack of use.
Strong glutes, quads, legs in general take the strain off joints as the muscles are doing the work. Strong quads protect the knees.