Kelvin Hsu | Online Fitness Coach on Instagram: "❌The biggest lie in the gym for men over 30: sweating means progress. Think of your muscles like a phone battery. 🔋 When you lift weights, you drain the battery. Between sets, your body needs a quick recharge (rest) so you can power up for the next heavy set. If you spend that “recharge time” doing jumping jacks or burpees, you’re not letting the battery refill. & when it’s time to lift again, you’re running on low power… and you can’t push as ha