In short: boat pose balances on the sitting bones with the legs lifted and the torso leaning back, so the body makes a V; the arms reach forward parallel to the floor. It works the deep abdominal muscles, hip flexors and back. Begin with the knees bent and the hands behind the thighs, keep the chest lifted and the lower back long, and straighten the legs only when the spine stays tall.
Boat is one of the classic core poses, and most people find it hard at first: the legs feel heavy and the back wants to round and roll down onto the tailbone. The trick is in the order of things. Sit up on the sitting bones first, lift the chest, and only then lift the feet. A boat with bent knees and a tall spine does more good than straight legs with a collapsed back.
The name
Nāvā means boat and paripūrṇa entire or complete. In Light on Yoga the full pose, Paripūrṇa Nāvāsana, has the legs raised to about 60 to 65 degrees with the arms parallel to the floor, which Iyengar likens to a boat with oars. The Ashtanga primary series calls the same V shape simply Navāsana, and Yoga Journal uses both names. Be aware of two other “boats”. The Bihar School’s naukasana (from naukā, another word for boat) is a different exercise: you lie on your back and lift the head, arms and legs together about a foot off the floor. And “half boat” means different things in different books, as the section below explains.
How to make it work
Start in staff pose, bend the knees and put the feet on the floor. Hold the backs of the thighs and use them to lift the lower back in and up, so you are on the sitting bones rather than the tailbone; Yoga Journal suggests rocking back and forward a few times to feel the difference. Lean back a little with the arms nearly straight, then lift the feet until the shins are parallel to the floor. If that is steady, reach the arms forward, palms facing each other, and, later, straighten the legs. Keep the shoulders down and the head in line with the shoulders rather than jutting forward. Light on Yoga suggests half a minute, building to a minute; in Ashtanga you hold five breaths, lower or lift up through the hands, and repeat three to five times.
Precautions in plain words
Boat is demanding on the lower back if the spine rounds: keep the knees bent until the back stays long, and stop if you feel strain in the lower back or the hip flexors. Avoid it in pregnancy and after recent abdominal surgery, and take care with diastasis recti; ask your health care provider. With neck problems, keep the head in line with the spine and do not jut the chin. Do not hold the breath. This page is general information, not individual advice.
Half Boat (Ardha Navasana)
“Half boat” has two meanings. In many modern classes it is the bent-knee boat: the same balance on the sitting bones with the shins parallel to the floor, the usual first stage of the full pose. In Light on Yoga, however, Ardha Nāvāsana is a separate pose: the fingers are interlocked behind the head, the trunk reclines further back and the straight legs are lifted only about 30 to 35 degrees, with the crown of the head in line with the toes, held 20 to 30 seconds. Iyengar notes that in the full boat the legs are higher and closer to the trunk. Both versions are intermediate core work; with the hands behind the head, take care not to pull on the neck. If your teacher says “half boat”, it is worth checking which one they mean.
Preparation, what comes next and where it is taught
Prepare with staff pose, plank and the leg lifts of upward extended legs. Afterward, release the back with wind-relieving pose or a gentle twist, or fold forward in seated forward bend. Boat strength helps in arm balances such as crow. You will find it in the Ashtanga primary series, in Iyengar, vinyasa and hatha classes.
