27/08/2025
When most people think of “cardio” or “conditioning,” they imagine hopping on a treadmill and pushing themselves until they’re sweating buckets or sending a hybrid style workout. But here’s the thing, your body yields different adaptations, depending on what intensity you do (Specific Adaptations to Imposed Demands.)
If you always train at the same pace, you’re only ever getting a fraction of the results.
Low Intensity: Building the Engine
• A brisk walk, easy cycling, light jogging, or steady rowing.
• Breathing is controlled, you can still hold a conversation.
What it does:
• Strengthens the heart, allowing it to pump more blood per beat.
• Improves your body’s ability to use fat for fuel.
• Boosts recovery by improving circulation.
• Creates a bigger “base” of endurance so higher efforts feel easier.
Benefit: You’ll feel less tired climbing stairs, recover quicker after workouts, and have more steady energy throughout the day.
Moderate Intensity: Raising the Bar
• A hard run, spin class, or intervals where you’re working hard but not sprinting.
• Breathing is heavy, but you can hang on for several minutes.
What it does:
• Trains your body to handle and clear lactic acid, reducing the “burn.”
• Improves stamina at higher effort levels.
• Builds resilience to fatigue.
Benefit: You’ll be able to keep up a demanding pace, whether that’s a long hike, a tough gym class, or keeping up with your kids, without crashing out.
High Intensity: Top end effort, Power & Speed
• Short sprints, all-out intervals on a bike, or explosive bodyweight moves.
• Max effort for 10–30 seconds, followed by proper rest.
What it does:
• Improves your ability to produce bursts of speed and strength.
• Trains fast-twitch muscle fibres for power.
• Boosts calorie burn and metabolic rate after training.
Benefit: You’ll have the capability to operate at high paces in short bursts, whether that’s running for the bus or performing at high end effort within your sport.
Each intensity of training, measured by % max heart rate, trains these different adaptations. The most effective fitness routines don’t stick to just one, they stack all three, so you’re fit, resilient, and ready for anything.