Question

When you sit up straight for a long time, the __________ holds a lot of your body weight.

A.
upper back

B.
lower back

C.
mid-back

D.
neck

Answer 1

Answer: i believe the answer is lower back

Explanation:

The flexor muscles are in the front and include the abdominal muscles. These muscles enable us to flex, or bend forward, and are important in lifting and controlling the arch in the lower back. The extensor muscles are in the back. These muscles allow us to stand upright and lift objects