MANUAL RESISTANCE TECHNIQUES
Manual resistance techniques (MRT’s) are part of a broad classification of manual therapy techniques directed at improving musculoskeletal function, and improving pain. MRT’s are commonly utilized by Manual Therapists, Osteopaths, Physical Therapists, Chiropractors, Athletic Trainers, and Massage Therapists.
Manual resistance techniques can be thought of as a form of therapeutic stretching. The techniques can be used on basically any muscle in the body as a way to relax tissues, increase range of motion, and decrease pain. These techniques can be 
used on both acute and chronic injuries. The use of these techniques requires proper communication and cooperation between patient and practitioner. Typically the patient will be asked to contract a muscle against resistance and then followed by a period of relaxation of that same muscle while the practitioner applies a deep stretch. Stretching immediately after a contraction is believed to utilize a phenomenon known as reciprocal inhibition to essentially ‘trick’ the body into allowing a deeper stretch and potential release of myofascial trigger points. Manual resistance techniques such as post-isometric relaxation (PIR) and post-facilitation stretch (PFS) are gentle techniques that can either complement, or replace, manual therapies such as joint manipulation and myofascial release.
For an example of Manual Resistance Techniques in action, please visit the link below to watch the master, Leon Chaitow. The video is a bit slow but there is a ton of good information to take away.
http://www.youtube.com/watch?v=D6ay9Di10kg
1. Wikipedia.com