Recommend how to set up for practice in your home
1. Find around 2 ~4 meters of a flat and straight path
2. Decide a middle point 1 meter apart from the starting point.
3. Build a narrow path made by two blocks like a bottle
4. Try to pass the path and reach to the end.
Some tips
1. The more success rate to pass, the narrower the path
2. Different sounds of bottles would make you keep your head
3. It is good practice for your confidence of your short stroke
4. If you can add distance control mission with change stroke distance
5. Forwarding hand, keep hand face, similar back and forth stroke distance would help.