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Sleep & Fitness Performance: Why Rest Matters | CFBC from CrossFit BC. No supplement, program, or coach can fix bad sleep. It affects strength, recovery, and body comp more than anything you do awake.
Why Sleep Is the Most Underrated Tool in Your Fitness Toolkit
This article is part of the CrossFit BC journal, written by the coaching staff who run our classes in Olympic Village, Vancouver. We publish what we teach on the floor: training decisions, recovery, nutrition, and the honest tradeoffs behind them.
Most active adults need 7 to 9 hours of sleep per night. If you're training regularly at high intensity, aim for the higher end of that range. Sleep is when your body repairs muscle, releases growth hormone, and consolidates the motor skills you're developing.
Yes, significantly. Research shows that even one night of poor sleep (under 6 hours) can reduce strength output by up to 20% and increase how hard exercise feels. Chronic sleep deprivation compounds these effects and can lead to plateaus, increased injury risk, and slower recovery.
Absolutely. Studies show that people who sleep 8.5 hours lose significantly more fat than those sleeping 5.5 hours on the same diet. Sleep deprivation also increases hunger hormones and cravings for high-calorie foods, making it harder to stick to healthy eating habits.