Characteristics for calisthenics include all of the following except:
a.
performing calisthenics can improve flexibility.
b.
examples include yoga and pilates.
c.
calisthenics requires complex equipment.
d.
performing calisthenics can improve muscular strength and flexibility.

B. Examples include yoga and pilates.

Explanation:

Characteristics for calisthenics can help improve flexibility, they are often performed with minimal equipment and it can help improve muscular strength and flexibility.  

C. Calisthenics requires complex equipment.

Explanation:

Calisthenics can be defined as a set of physical exercises performed without equipment, or with simple equipment that allows the execution of intense muscle movements that stimulate muscle power and effort.

about calisthenics we can say that:

hmmm

true, i think.

i checked and it seems the answer is, true.