at 3K to 5K race pace will work your cardiovascular system to its limit, which will help increase the stroke volume of your heart and improve your muscles' ability to use oxygen to produce energy aerobically," explains Karen Hancock, coach
from your body in every race you do can lead to injury, lasting fatigue and psychological issues, which can hamper your running for life."To read the full 14 fixes - including advice on hitting the right pace in each training session and performing well
of your training that needs some work for your next phase of training. Change only that one thing, says Hayes. "If you change two things and have the best season you've ever had, how will you know which change worked?" Check your pace While varying
