D Type. He is changing the type of activity he is doing for his bike-riding routine.
Answer:
If you are caught between a rock and a hard place, you are in a difficult situation where you have to choose between two equally unpleasant courses of action.
Lets see if i remember them all.
okay, nervous, skeletal, muscular, um...the blood one(i forget what its called)
and i think thats it
Answer:
c
Explanation:
the only one that helps the rest are going to put you into complicated situations mixed with a young couples puberty and hormones