According to the exercise principle of balance, a workout should
a.
address all components of fitness
b.
focus on balance and coordination
c.
target specific areas for improvement
d.
vary exercise activities over time

According to the exercise principle of balance, a workout should .
D.
vary exercise activities over time

A.children playing educational games

Bmust be the answer, as technically all organs move, so a is incorrect. all organs are made of different types of cells, so that isn’t a problem, so c is also incorrect. human hearts are very similar to many other animals’ hearts, so d is also incorrect, yet the heart is made of muscle, which is hard to grow in the lab so it would be correct to say b