How Hard Was Your Workout, Really? There's a Number for That.
Briefly

Training load combines the length and intensity of a workout into one metric, allowing athletes to measure their exercise difficulty and optimize training routines.
Carl Foster noted that training load is a brilliant concept that helps athletes structure their training with the right mix of easy and hard days.
Despite the benefits of training load metrics, some experts caution that it may distract users from more fundamental signals from their bodies during training.
Modern fitness trackers use algorithms to approximate training load, presenting it as an important statistic alongside other fitness metrics like heart rate and step count.
Read at www.nytimes.com
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