That pounding sensation during summer isn’t just an off day—it’s your heart working overtime to cool your body. But there’s a critical line between normal heat response and genuine danger that could save your life.
When temperatures rise, your heart rate climbs even at familiar paces—but it’s not a sign of lost fitness. Your cardiovascular system is solving a redistribution problem, juggling blood flow to working muscles and cooling skin simultaneously. Understanding cardiovascular drift changes how you should train in summer heat.
Pre-workout supplements flood your bloodstream with stimulants 15-60 minutes after ingestion, often peaking while you’re still stretching. A 200-400mg caffeine dose creates significant cardiovascular load before you’ve lifted a single weight—here’s what the science says and how to train smarter.
