Q&A #21 - Training to heart rate or power, improving your aerobic engine for the swim, and are intervals better than long slow distance training?    Do the day to day variations of heart rate mean it's better to train to power (or pace), even though you have assessed your heart rate zones using a lactate test? Things to consider to get the most out of your lactate tests How should you train to you improve your aerobic engine for the swim?  Are intervals better than traditional long runs or ride for improving VO2max?    LINKS AND RESOURCES:   That Triathlon Show website  Coaching Training Plans Q&A #20 - Testing for half and full distance triathlon: are typical 20-minute tests relevant, and are there better options?     RATE AND REVIEW:   If you enjoy the show, please help me out by subscribing, rating and reviewing.      CONTACT:   Want to send feedback, questions or just chat? Email me at mikael@scientifictriathlon.com or connect on Twitter - my handle is @SciTriat.