Which of the following exercise combinations will lead to the greatest increases in serum testosterone concentrations in a 16 year old male baseball player?
A . Back barbell squats with 50% of 1 RM for 3 sets
B . Back barbell squats with 90% of 1 RM for 3 sets
C . Lat pulldowns with 50% of 1 RM for 3 sets
D . Lat pulldowns 90% of 1 RM for 3 sets
Answer: B