function calcLT(){var t400=document.getElementById("t400").value||"4:50";var p=t400.split(":");var secs=parseInt(p[0])*60+(parseInt(p[1])||0);var pace100=secs/4;var lt100=Math.round(pace100*1.12);var race100=Math.round(pace100*0.87);document.getElementById("r1").textContent=Math.floor(lt100/60)+":"+String(Math.round(lt100%60)).padStart(2,"0")+"/100m";document.getElementById("r2").textContent=Math.floor(race100/60)+":"+String(Math.round(race100%60)).padStart(2,"0")+"/100m";document.getElementById("desc").innerHTML="Lactate threshold pace: "+Math.floor(lt100/60)+":"+String(Math.round(lt100%60)).padStart(2,"0")+"/100m
100m race pace: "+Math.floor(race100/60)+":"+String(Math.round(race100%60)).padStart(2,"0")+"/100m
Threshold training should be at the pace you can hold for 15-20 min, multiplied by 1.05-1.10 for training sets.";document.getElementById("results").style.display="block";}