Have you ever heard of Mountain Pose or Samasthiti (Tadasana)?
The body is in the standing position, with the feet together and rooted into the earth. The weight of the body is evenly distributed on the four corners of the feet. The pelvis is tucked. The ribcage is lifted. The neck is a natural extension of the spine and the chin is slightly tucked toward the sternum. The shoulders are relaxed as they rotate back and down. The arms at your sides. The gaze is forward.
Improves posture. Strengthens thighs, knees, and ankles. Firms abdomen and buttocks. Relieves sciatica. Reduces flat feet.
check this out to get full info about this yoga pose. Practice and be healthy!