When we get to a certain point in Rocket Yoga where we attempt Eka Pada Bakasana (one-legged crow pose), I give specific instructions. I tell them to place their front foot on the ground with the knee up. Place the knee on the same side upper arm. Plant your hands and start to raise your back leg straight off the ground. That’s the shape!! We don’t need to go further. But maybe, just maybe, we can begin to pull the front toes off the ground and balance fully on our hands.
To be honest, only a select few can do the pose in my classes. And even for those who CAN usually don’t hold it for the full 3 breaths. But none of that matters. What matters is making the shape. Then, the intention for the pose is fulfilled. You still engage the same muscles whether you are in the full variation or not.
Side note: One pet peeve of mine is when people call some other pose a boat pose (Navasana). You have to ask yourself, what is the intention of the pose? If I’m not mistaken, its to develop uddiyana bandha and the muscles of the psoas and frontal torso. Oh, and a side peeve, I don’t agree that yoga = fitness, so I don’t call it “core”. This isn’t a body pump class. The other poses that people call Navasana are Ubhaya Padanghustasana, Urdhva Mukha Paschimottanasana, and Upavistha Kapotasana B. They are not intended to be boat pose. If they are not strong enough for the full, straight-legged variation, then have them bend their knees. They may even lightly rest or hover their toes off the floor. Regardless, their anterior chain is engaged and working. You disengage if you grab toes or legs.
I just saw a picture of someone doing triangle pose (Trikonasana). Only the student had her front leg very bent. The intent of the pose is to lengthen hamstrings, glutes, and side body. So if the leg is bent, it is not meeting the intention of the pose. The adjustment I would make is to bring the student back up. Then take a block with their front hand from the long end; straighten both legs and make them straight and strong (straight meaning not hyperextending); hinge forward at the hip with legs straight; then place the block on either side of the leg directly beneath their shoulder onto the floor. The student doesn’t meet the intention if they don’t do this correctly.
When making adjustments as teachers, it is imperative that we know the intention for every pose. And it may not be the pose at all. You may be focused on a drishti or chakra or body part. Whatever it is, meet the intention. Always ask yourself “why” you are doing a pose. If a yogi cannot do the full expression of a pose, then modify to meet the intention. Usually it means making the same shape even if they are not flying or binding or whatever it is. Every BODY can do every pose.