When volume and intensity are matched, machine-based resistance training and free-weight resistance training produce equivalent levels of muscle hypertrophy in trained individuals.

Study: Effect of free-weight vs. machine-based strength training on maximal strength, hypertrophy and jump performance – a systematic review and meta-analysis

This study compared lifting weights with barbells versus using machines and found that both ways build muscle just as well, as long as you do the same amount of work and lift the same effort level. So, whether you prefer machines or free weights, your muscles grow the same.

Study: Effect of free-weight vs. machine-based strength training on maximal strength, hypertrophy and jump performance – a systematic review and meta-analysis

This study compared lifting weights with barbells versus using machines, and found that both ways build muscle just as well — as long as you do the same amount of work and lift with similar effort. So, you can pick whichever you like better.

Study: Free-Weight and Machine-Based Training Are Equally Effective on Strength and Hypertrophy: Challenging a Traditional Myth

The study found that lifting weights with barbells and using machines led to the same muscle growth in trained people, as long as they lifted the same amount of weight with the same effort. So, neither method is better for building muscle.

Study: Free-Weight and Machine-Based Training Are Equally Effective on Strength and Hypertrophy: Challenging a Traditional Myth

The study gave two groups of trained lifters either free weights or machines, but made sure they did the same amount of work at the same effort level. After 8 weeks, both groups grew their muscles equally, so neither method is better for building muscle when you train the same.