Losing weight and not gaining too much muscle requires a specific approach that involves a combination of diet and exercise.

1. Focus on a calorie deficit: Losing weight requires creating a calorie deficit, which means consuming fewer calories than your body burns. Focus on a balanced diet that is low in calories, but still provides you with enough energy to fuel your workouts and daily activities.

2. Cardiovascular exercise: Incorporating cardiovascular exercises like running, cycling, or swimming into your workout routine can help burn calories and reduce body fat without promoting muscle growth.

3. Resistance training: While resistance training is essential for building muscle, the key is to use lighter weights with higher reps. This approach will help you tone your muscles without adding significant mass.

4. Be mindful of your protein intake: Consuming a high-protein diet can help support muscle growth, which is great if you want to build muscle, but not ideal if you're trying to avoid it. Be mindful of your protein intake and aim for moderate levels of protein to avoid muscle growth.

5. Get enough rest and recovery: Adequate rest and recovery are essential for achieving your weight loss and fitness goals. Make sure you're getting enough sleep, taking rest days as needed, and giving your body time to recover between workouts.

Remember, losing weight and building muscle are two different goals that require different approaches. By following these tips, you can lose weight without adding significant muscle mass. However, it's important to note that some muscle gain is inevitable when you exercise, and that's not necessarily a bad thing. Building lean muscle can improve your metabolism and help you maintain your weight loss over time.