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Sleep, stress, and dehydration can all raise or lower heart rate on any given day, which makes heart rate training less accurate than we\u2019d like.

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That\u2019s why co-founder and lead engineer of Stryd Jamie Williamson decided it was time for a change.

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With his business partner Li Shang and a team of like-minded \u201csports nuts\u201d, Jamie set out to create the world\u2019s first wearable power meter for running.

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Stryd understands how fast you can run and how long you can run by measuring energy output three dimensionally.

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Its unique environmental sensors measure your movements - including forward and back, side to side, and up and down - to determine how fast, how far, and how efficiently you can run across any terrain.

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And that\u2019s not even the best part.

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It collects this data at lab grade power to give you real-time, actionable target numbers that let you know how efficiently you\u2019re running and make reaching your goals a whole lot simpler.

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Listen in as Jamie discusses how Stryd works and why power is quickly replacing heart rate training.

2:57 What prompted you to start Stryd and how has the process been so far?

7:39 How did you become interested in producing technology for runners and cyclists to train more efficiently?

9:49 How does Stryd differ from other devices like GPS watches?

13:52 What is \u2018power\u2019 as a unit of measurement?

21:07 What are the inherent issues with training by heart rate and how is Stryd more accurate?

26:37 What exactly is \u2018critical power\u2019 and how does it relate to lactate threshold and/or VO2 max?

27:49 Can someone simply determine their critical power from a 10k race?

29:25 Are other tests for critical power available on your website?

30:31 How does Stryd help runners with running efficiency, form and injury prevention?

34:19 When you're testing for inefficiencies with Stryd, do you get real-time feedback?

36:25 How compatible is Stryd with other technology?

39:37 Will Stryd ever be able to measure environmental factors such as wind?

41:50 What else is Stryd focusing on right now?

\u201cWe have report after report after report of personal bests that people were getting where they were up against the wall and this technology allowed them to identify weaknesses that they could work on.\u201d

\u201cComputing real-time pace is extremely difficult...When you\u2019re in a car and you use your GPS, you can actually use it as a speedometer, but that\u2019s just because the signal is so huge. You\u2019re changing large amounts of position over short amounts of time because you\u2019re going fast in a car, and it\u2019s the opposite when running.\u201d

\u201cPower is useful because it\u2019s the only independent, objective measure of running performance,. It\u2019s not impacted by any other things.\u201d

\u201cYou start the race with a full battery - that\u2019s how much energy you have to spend in that race. Given the duration of the race, at the very end you want the battery to be empty. You don\u2019t want it to be negative, you don\u2019t want to leave some stuff on the course where you still have some energy to spare\u2026.You want to have nothing left at the end, and power is the way to do that.\u201d

\u201cI will say a lot of people do use heart rate as kind of a safety measure. They\u2019ll look at \u2018What is my max heart rate that I want to stick to today and I don\u2019t want to go above?\u2019, and they\u2019ll use it in that way to make sure they\u2019re not overdoing it.\u201d

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