Triathlon Taren talks about several studies that determine what's the most important for triathlon performance, swimming, biking and cycling, or running and
Which Is a Better Workout: Running, Swimming or Cycling?
Walk, Run, Swim Or Bike — The Most Important Exercise Is Merely
Runner to Triathlete: How Your Training Plan Will Change
TRIATHLON TRAINING PLAN diy for any number of weekly workouts
What is 1 mile swimming equivalent to running? - Quora
What to eat before cycling
Swimming vs. Running: Which is Better for Fitness?
What's better: 30 minutes of swimming or running? - The Globe and Mail
4 Training Myths for Cyclists 50 and Older - Chris Carmichael
7 Triathlon Mistakes You Need To Avoid!