Hip mobility is important to protect the lower back from pain and for fluid movement of our legs.
Note that you don’t need to do pulse stretches. You can always use that time to do a “gravity stretch”, just relaxing into the stretch.
Tango requires a lot of spinal rotation. Many people also experience back pain. If you need advice about what is hurting your back, feel free to contact us, we can usually figure it out and give you personal exercises to do.
Most people need to strengthen the transverse abdominus.
My back pain is always improved by a 5 minute gravity stretch just hanging my torso down over standing legs. This is most effective if you do not touch the floor. You can bend your knees as in the photo.
Ankle flexibility requires foot strength. They enables more powerful transfer of weight, and pointier toes.