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"Supine" means that he's laying down on their back. Ideally, you can find an elevated surface for them to lay on which allows you to stand or sit in a chair at their head. If they lay on the ground, you’ll have to bend over quite a bit, and this could hurt your back. .  Tie long hair back so it doesn’t hang in your partner's face. If they have long hair, sweep it back and over the side of the table or bed so you don’t accidentally pull it during the massage. Ask them to either remove their shirt or to wear a top that exposes their chest from the collarbone up. You should provide a towel or blanket if he's uncomfortable with exposing their chest. You can sometimes find massage oils at department stores, but if not, they can be purchased online.  Some household oils, like coconut oil, also make wonderful massage oils. Olive oil, almond oil, and sesame oil can work well, but they tend to be heavy and thick. Use smaller amounts of these oils for a massage. Make sure your partner doesn't have any nut allergies before using almond or sesame oil. Work the oil or lotion through your hands by rubbing them together. This warms the product up to make it more comfortable for them.
Place your partner in the supine position. Choose a massage oil or lotion.