An adjustable exercise suspension system and related methods of use and exercise are disclosed. The system includes a length-adjustable suspension strap assembly attached at one end to a fixed overhead support structure and at an opposite end to a weight element. The strap assembly comprises a plurality of straps detachably connected together. The weight element is suspended from the overhead support structure creating a tensile force in the strap assembly establishing a taut condition. The weight element is manually movable by a user during the exercise routine along an arcuate path in a plane of stable motion while the tensile force maintains the taut condition of the strap assembly. The strap assembly advantageously provides guided and stabilized motion of the weight element for the user thereby minimizing risk of injury. The resistance force of the system is user-variable by attaching different size weight elements to the strap assembly.