Anaerobic System

Definition

The anaerobic system produces energy without using oxygen. It instantly powers short, intense efforts: sprints, heavy lifts, jumps. Two distinct subsystems make up this pathway.

💡 The anaerobic system delivers fast but burns out fast. It's the dragster vs. the long-distance car (aerobic system).

The 2 anaerobic subsystems

1. ATP-PC system (alactic anaerobic)

Uses phosphocreatine stored in muscle to instantly regenerate ATP. Maximum power, ~10 seconds of duration.

Used for: 100 m sprint, 1RM, jumps, heavy throws.

2. Glycolytic system (lactic anaerobic)

Breaks down glucose without oxygen, producing ATP + lactate as a byproduct. Lasts 30 sec to 2 minutes.

Used for: 400-800 m sprint, hypertrophy sets, mid-distance efforts.

Comparing the energy systems

Why develop your anaerobic system?

• Stronger and more explosive
• Better short-effort performance
• Higher anaerobic capacity
• Better lactate clearance
• Boosted heart rate, more efficient cardio

How to develop the anaerobic system

For ATP-PC (max power)

• ✅ Heavy lifting: 1-5 reps at 85-100% 1RM
• ✅ Short sprints: 50-100 m all out, 2-3 min rest
• ✅ Plyometrics: jumps, throws, explosive movements

For glycolytic (lactate capacity)

• ✅ HIIT: Tabata, 4x4 bursts
• ✅ Mid-distance sprints: 400-800 m
• ✅ Hypertrophy sets: 8-15 reps with short rest
• ✅ Circuit training / EMOM: high lactate buildup

The myth of lactic acid

⚠️ The anaerobic system produces lactate, NOT lactic acid. Lactate is now considered a useful energy source, not pure waste. The "burn" is caused by H+ ions, not lactate itself.

Key takeaways

The anaerobic system is essential for any lifter: it powers heavy sets and explosive efforts. Develop it via heavy lifting (ATP-PC) and HIIT/hypertrophy (glycolytic). Don't neglect it just because you're not a sprinter.