Bipedal gait cycle
A (bipedal) gait cycle is the time period or sequence of events or movements during locomotion in which one foot contacts the ground to when that same foot again contacts the ground, and involves propulsion of the centre of gravity in the direction of motion. A gait cycle usually involves co-operative movements of both the left and right legs and feet. A single gait cycle is also known as a stride. Each gait cycle or stride has two major phases: Components of gait cycle. A gait cycle consists of stance phase and swing phase. Considering the  number of limb supports, the stance phase spans from initial double-limb stance to single-limb stance and terminal double-limb stance. The swing phase corresponds to the single-limb stance of the opposite leg. The stance and swing phases can further be divided by seven events into seven smaller phases in which the body postures are specific. For analyzing gait cycle one foot is taken as reference and the movements of the reference foot are studied. Phases and events. Stance Phase: Stance phase is that part of a gait cycle during which the foot remains in contact with the  ground. It constitutes 60% of the gait cycle (10% for initial double-limb stance, 40% for single-limb stance and 10% for terminal double-limb stance). Stance phase consists of four events and four phases: Swing Phase: Swing phase is that part of the gait cycle during which the reference foot is not in contact with the ground and swings in the air. It constitutes about 40% of gait cycle. It can be separated by three events into three phases: