Bruce Algra's Fitnus Charts are world famous for their anatomical detailed and beautiful graphics! Perceived Exertion The new and updated version of the Perceived Exertion by world-famous artist Bruce Algra presents 13 colorful zones to rate your training level. This guide gives you an idea of how hard you exercising without having to stop to take your heart rate. Learning to use this scale will take a little practice, but is not difficult. MADE IN THE USA
