Cardio Training Guide

Not all cardio is equal. Different types produce different adaptations — understanding them helps you train smarter.

• HIIT (High Intensity Interval Training) – Alternates max effort bursts with rest. Burns more calories in less time, elevates metabolism post-workout (EPOC)
• LISS (Low Intensity Steady State) – Sustained low-moderate effort (60–70% max HR). Walking, easy cycling, light jogging. Great for recovery days and fat oxidation
• Tempo / Threshold – Sustained effort at 80–90% max HR. Builds lactate threshold and aerobic capacity. Uncomfortable but powerful
• Fartlek – Swedish for "speed play". Unstructured intervals mixed into a run; great for runners wanting variety without strict structure
• Circuit Training – Combining strength and cardio moves in rapid succession; builds both simultaneously

Training by heart rate zones ensures you get the right stimulus from each workout. Max HR ≈ 220 − your age.

• Zone 1 (50–60% max HR) – Very light. Active recovery, warm-up, cool-down
• Zone 2 (60–70% max HR) – Fat burning zone. Long, easy aerobic base building. Can hold a full conversation
• Zone 3 (70–80% max HR) – Aerobic endurance. Moderate effort. Can speak in short sentences
• Zone 4 (80–90% max HR) – Threshold. Hard effort. Only a few words at a time
• Zone 5 (90–100% max HR) – Maximum effort. Sprint intervals, HIIT peaks. Unsustainable for more than minutes
• For most people: 80% of training in Zones 1–2, 20% in Zones 4–5 (polarized model)

Here are structured programs across three levels. Pick the one that matches your current fitness.

• Beginner (Weeks 1–4): 3x/week – 20 min brisk walking → build to 30 min jog/walk intervals
• Intermediate (Weeks 5–8): 4x/week – 30 min LISS + 1 HIIT session (20 min: 30s sprint/90s walk × 8)
• Advanced (Weeks 9–12): 5x/week – 2 HIIT + 2 LISS (45 min) + 1 tempo run (30 min at threshold)
• HIIT example: Treadmill 10 min warm-up → 8×30s at 90%, 90s walk → 5 min cool-down
• Fartlek example: 30 min run with 8×1 min pickups at hard effort sprinkled throughout

Each cardio modality has unique benefits and drawbacks. Here's how the most popular options stack up.

• Running – Highest calorie burn (~600 kcal/hr). High impact; higher injury risk for overweight beginners
• Cycling – Low impact, great for joints. Indoor bikes or outdoor. Burns ~500 kcal/hr
• Swimming – Full-body, zero impact, excellent for injured athletes or joint issues. Burns ~400–600 kcal/hr
• Rowing – Underrated total body workout; hits 86% of muscle groups. Burns ~600 kcal/hr, low impact
• Walking – Most accessible, zero barrier to entry. Burns ~250–350 kcal/hr; easy to sustain daily
• Jump Rope – Cheap, portable, high calorie burn. ~700 kcal/hr. Great for HIIT with zero equipment