Zach updates his current training, discusses listener questions about: metabolic flexibility, keto, training for hilly course, shoe stack height, and aging athletes. Also included, a workout challenge for listeners and a sample day of training and nutrition! Episode Sponsors: LMNT & BiOptimizers - Details & Discounts: zachbitter.com/hposponsors Support HPO: patreon.com/HPOpodcast or zachbitter.com/hpo Zach: zachbitter.com IG: @zachbitter Tw: @zbitter FB: @zach.bitter Strava: Zach Bitter