 This paper proposes a new method for measuring muscle force using wearable, ultra-sensitive soft strain sensors. These sensors are capable of accurately estimating peak joint torque reduction caused by muscle fatigue with main NRMSE dollar equals 0.15 backslash PM3 cents. This technology could be used to measure muscle force in controlled settings or continuously monitor muscle health in real time. This article was authored by Jonathan T. Alvarez, Lucas F. Gares, Al-Yawazian A. Araromi and others.