1.Downsweep: from the hand (or segment extremity for arm amputees swimmers) to entry into water to the most lateral position of the stroke. 2.Insweep: from the end of the first phase to the most medial position of the stroke. 3. Upsweep: from the end of the insweep to the hand exit of water. 4. Recovery phase: from the hand exit of water until its next entry.