Cardio before or after weight training?

Incorporating cardio and strength training into your routine often raises the question: should you do cardio before strength training or vice versa? The answer depends on your main objective: building muscle mass, losing weight, or maintaining your endurance.

Objective: gain muscle mass

If your primary goal is to build muscle mass with heavy exercises like deadlifts or bench presses, reserve your nervous energy for your strength training session. Doing an intense cardio exercise (running, jump rope, treadmill) before loading the bar weakens your lifting capacity, decreases your maximum strength, and can increase the risk of injury. To optimize muscle strengthening, first do your bar sets, then switch to 10-15 minutes of moderate cardio if you want to maintain good aerobic capacity.

Objective: lose weight or maintain endurance

When weight loss or endurance improvement is a priority, starting the session with effective cardio (interval training on the treadmill, jump rope circuit) allows you to first draw from carbohydrate reserves, then finish the session with light strength training. This cardio before strength training intensifies energy expenditure and can create a deficit that promotes fat loss without too much muscle mass reduction, provided you maintain reasonable loads and sufficient protein intake.

Combine without sacrificing

For those looking for a compromise, one option is to separate the two activities: cardio in the morning, strength training in the evening (or vice versa), allowing 4-6 hours of recovery. This way, you combine the benefits of an effective cardio workout and an optimal strength session, without having to choose one at the expense of the other.

Structuring example according to your priorities

• Muscle mass : Monday/Wednesday heavy full-body sessions (deadlifts, bench press), light cardio for 10 min at the end of the session.
  

• Weight loss : Tuesday/Thursday sessions 20 min of HIIT (jump rope, treadmill) + 30 min of medium volume strength training.

• Mix : light morning cardio + strength training at the end of the day, or post-strength training cardio twice a week.
  

The choice of doing cardio before or after strength training mainly depends on what you prioritize: strong lifting capacity and muscle gain, or calorie deficit and weight loss. By intelligently organizing your training sessions, you can progress on both fronts without compromising either your strength or your endurance.