# 306. How the GOAT Fuels, Single v. Double Workouts, Heat and Altitude Study, Caffeine Genotypes, and Building Bone Density!

Page: https://stenobird.com/podcast/some-work-all-play-150821/306-how-the-goat-fuels-single-v-double-workouts-heat-and-altitude-study-caffeine-genotypes-and-building-bone-density
Text version: https://stenobird.com/podcast/some-work-all-play-150821/306-how-the-goat-fuels-single-v-double-workouts-heat-and-altitude-study-caffeine-genotypes-and-building-bone-density.md
Podcast: [Some Work, All Play](https://stenobird.com/podcast/some-work-all-play-150821)
Published: 2026-04-14T13:14:10+00:00
Episode link: https://podcasters.spotify.com/pod/show/someworkallplay/episodes/306--How-the-GOAT-Fuels--Single-v--Double-Workouts--Heat-and-Altitude-Study--Caffeine-Genotypes--and-Building-Bone-Density-e3ht27b
Audio file: https://anchor.fm/s/9abbbe4/podcast/play/118441643/https%3A%2F%2Fd3ctxlq1ktw2nl.cloudfront.net%2Fstaging%2F2026-3-14%2F19dfda00-d0df-7e48-6ded-435250b295ee.mp3
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JSON: https://stenobird.com/v1/public/podcasts/some-work-all-play-150821/episodes/306-how-the-goat-fuels-single-v-double-workouts-heat-and-altitude-study-caffeine-genotypes-and-building-bone-density
Duration seconds: 5624

## Resource

We got overconfident with a shoe experiment before this great episode! It started with a discussion of race-day fueling of Tadej Pogacar (who might be the greatest endurance athlete ever). 250 grams of carbs and 1430 calories for breakfast?! We zoom out to talk about cycling fueling generally, along with possible gender differences. Then it was a big science discussion on a new study on heat and altitude that upended some of the older conventional wisdom. There seems to be increasing agreement across studies: heat training builds hemoglobin mass, and it may be additive when combined with altitude. And this one was full of awesome topics! Other topics: David’s shoe-alteration experiment that went horribly wrong, Megan’s tips for improving bone density, our upcoming Boston Marathon trip, a study on doing one workout versus two workouts in a single day, how caffeine genotype affect performance, supershoes and injury risk, how to think about sleep, and video games. Come for the science. Stay for the greatest roast of all time. David could be served with gravy at Thanksgiving after this one. We love you all! HUZZAH! -David and Megan Click "Get 40% Off" button for 40% off at The Feed here: thefeed.com/swap Buy Janji's amazing gear: https://janji.com (code "SWAP") The Wahoo KICKR Run is the best treadmill on the market: https://www.wahoofitness.com/devices/running/treadmills/kickr-run-buy (code “SWAP”) For training plans, weekly bonus podcasts, heart rate zones, articles, and videos: patreon.com/swap

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