Mike wants to improve his endurance because he wants to try out for the cross country running team in the fall. he works out at the local gym a few days each week and does a variety of activities, but he still feels like his cardiovascular fitness needs improvement. what would be the best thing for mike to do next?

he should begin a program of rigorous distance running immediately because it is the best way to increase strength fast.
he should continue with his activities but implement a high protein diet to supplement his goal to improve his cardiovascular fitness.
he should increase the frequency and intensity of his weightlifting program immediately to see more significant results.
he should reevaluate his workout to see if he needs to add more aerobic exercise or adjust the frequency of his workouts.