Day 25 is Half Moon or Ardha Chandrasana.
This is a balancing pose that can be challenging for beginners. You can use a block to steady yourself. If you are still having trouble balancing, try this modification: Hinge forward at the hips. Take your right leg straight behind you so you are standing on one leg. Keep both hands on the ground. Hold this pose for 30 seconds to a minute. Repeat on your other leg. Over time you will grow accustomed to balancing on one foot, and then you can attempt to open the hips in Half Moon.