In which phase of the OPT Model do clients build maximal strength?

Clients build maximal strength in Phase 4 of the OPT Model, known as Maximal Strength Training. This phase focuses on improving the client's maximum force production through heavier resistance training. The key principles in this phase involve lifting heavier weights with lower repetitions, which enables the development of muscle strength and size. This training typically involves compound movements and emphasizes proper form to handle the increased loads, which is essential for minimizing the risk of injury.

The goal in this phase is to improve the neuromuscular system's ability to generate force and enhance overall strength gains, which can lead to better performance in daily life and other training phases. Proper progression through this phase can significantly increase the client’s ability to handle heavier weights, thus maximally stimulating muscle growth and strength adaptations.