Lower body muscles are designed to the -body sit and stand comfortably -digestive system operate efficiently -upper spine maintain strength -heart provide oxygen to muscles and tissue

- body sit and stand comfortably

Explanation:

The role of lower limb muscles is to maintain balance during locomotion, and their role is rarely emphasized enough in posture. Many of the muscles act often, or predominantly, from their distal insertions. These muscles work so that we can sit and stand comfortably.

The lower limb contains many muscles that act on more than one joint and the isolated action of a lower limb joint is unusual.

The lower limb muscles can be divided into hip muscles, gluteal muscles, thigh muscles, leg muscles and foot muscles.