Final answer:
Effleurage is the massage stroke that has the least effect on blood circulation and is mainly used for relaxation purposes.
Step-by-step explanation:
Effleurage is the massage stroke that has the least effect on blood circulation. It involves long, sweeping strokes with light pressure, which are mostly used to warm up the muscles and promote relaxation.
On the other hand, petrissage, tapotement, and friction are more intense massage strokes that can have a stronger impact on blood circulation.