Jason Street has a pre-training VO2max of 65 mL/kg/min and wants to know how much it will increase after 8-12 weeks of rigorous endurance training (5+ days/week). Which of the following is correct? a. The only way to increase beyond his current VO2max is with concurrent endurance and strength training b. 2-3% increase in VO2max c. 30-50% increase in VO2max d. An increase in VO2max requires training for 7 days/week