This randomised-controlled trial investigates whether a single intervention of manual pressure release combined with stretching exercise has an effect on muscle length, pain perception threshold, and respiratory function in subjects with latent myofascial trigger point in the pectoralis minor muscle or not. First quarter of the participants will receive a single intervention of manual pressure release combined with contract-relax PNF stretching exercise of pectoralis minor muscle, second quarter of the participants will receive a single intervention of manual pressure release combined with Z stretching exercise of pectoralis minor muscle while, only a single intervention of manual pressure release will be applied to third quarter of the participants and final quarter of them will not receive any intervention.