1.0The Challengehttps://the-challenge.ch/en/Beat Steblerhttps://the-challenge.ch/en/author/beat/rich600338<blockquote class="wp-embedded-content" data-secret="eecGKM9HVN"><a href="https://the-challenge.ch/en/supplement-master-plan/">Supplement master plan</a></blockquote><iframe sandbox="allow-scripts" security="restricted" src="https://the-challenge.ch/en/supplement-master-plan/embed/#?secret=eecGKM9HVN" width="600" height="338" title="“Supplement master plan” — The Challenge" data-secret="eecGKM9HVN" frameborder="0" marginwidth="0" marginheight="0" scrolling="no" class="wp-embedded-content"></iframe><script> /*! This file is auto-generated */ !function(d,l){"use strict";l.querySelector&&d.addEventListener&&"undefined"!=typeof URL&&(d.wp=d.wp||{},d.wp.receiveEmbedMessage||(d.wp.receiveEmbedMessage=function(e){var t=e.data;if((t||t.secret||t.message||t.value)&&!/[^a-zA-Z0-9]/.test(t.secret)){for(var s,r,n,a=l.querySelectorAll('iframe[data-secret="'+t.secret+'"]'),o=l.querySelectorAll('blockquote[data-secret="'+t.secret+'"]'),c=new RegExp("^https?:$","i"),i=0;i<o.length;i++)o[i].style.display="none";for(i=0;i<a.length;i++)s=a[i],e.source===s.contentWindow&&(s.removeAttribute("style"),"height"===t.message?(1e3<(r=parseInt(t.value,10))?r=1e3:~~r<200&&(r=200),s.height=r):"link"===t.message&&(r=new URL(s.getAttribute("src")),n=new URL(t.value),c.test(n.protocol))&&n.host===r.host&&l.activeElement===s&&(d.top.location.href=t.value))}},d.addEventListener("message",d.wp.receiveEmbedMessage,!1),l.addEventListener("DOMContentLoaded",function(){for(var e,t,s=l.querySelectorAll("iframe.wp-embedded-content"),r=0;r<s.length;r++)(t=(e=s[r]).getAttribute("data-secret"))||(t=Math.random().toString(36).substring(2,12),e.src+="#?secret="+t,e.setAttribute("data-secret",t)),e.contentWindow.postMessage({message:"ready",secret:t},"*")},!1)))}(window,document); //# sourceURL=https://the-challenge.ch/wp-includes/js/wp-embed.min.js </script> https://the-challenge.ch/wp-content/uploads/2026/01/ChatGPT-Image-22.-Nov.-2025-22_33_35.png10241024Management Summary This supplement master plan is aimed at older endurance athletes who train regularly and want to maintain or improve their performance in the long term. The focus is not on short-term effects, but on a structured, sustainable approach. The plan is based on four equally important pillars: energy, performance, regeneration and mental stability.… Read More »