I think each person is different. I would really work on that which you are weakest and hopefully it will help your aerobic workouts for the other sports.

Good luck and work out hard and rest well also.

I am doing lazy brick workouts as my time schedule is really terrible. Sometimes I get in a half mile of swimming and then bike for 20 - 60 miles later in the same day. It depends upon my available time. Today was half mile swim at 12:00. 20 mile bike ride from 4:03 to 5:04 and then at 6:15 I did a two mile run.

I did my sprint triathlon, but it was over a long period of time with work thrown in there for fun I guess.