In order to prevent injury during your weight-training session, it is necessary to
a. do performance testing prior to setting up your workout routine, stretch before and after each workout, get the proper amount of rest and nutrition, and modify your workout as needed
b. have your friend check your workout to be sure it is well-designed, exercise only three days a week, and allow for adequate rest between workouts
c. never change your workout routine, stretch before and after each workout, allow time to warm up and cool down, and adjust your form as needed
d. use slow bouncing movements to warm up and stretch before each workout, follow a plan that includes proper sets and repetitions, adjust your workout and form as needed, and workout every day