This document provides instructions for a more efficient and revolutionary method of strengthening the trunk, legs, and cervical muscles using a strap called the "TIRANTE MUSCULADOR". It describes several exercises that can be performed with the strap to target key muscle groups like quadriceps, hamstrings, glutes, lower back, and cervical muscles. The exercises are eccentric/stretch-based and provide benefits like increased flexibility, strength and muscle elasticity with minimal risk of injury compared to other weight training methods. Recommendations are given for proper use of the strap in training routines, especially for athletes, to improve fitness and prevent injuries.