What bone is being used in the upward phase of a sit up?

Aperson who doesn't have enough calcium in his or her diet is at risk for developing bones that are weak and break easily. this condition is known as  a.  osteoporosis.    b.  crohn's disease.    c.  celiac disease.    d.  hemophilia.

There are two main levels of responsibility related to fitness and fire apparatus operations and preventing injuries and line of duty deaths. the first level involves personal responsibility. the second level involves

Lordosis can often be prevented by strengthening core muscles in the abdominals and back. a. true b. false