Flexibility
Handstand Hamstring Stretch 4×0:20

Static Shaping
3×0:30 30 Degree Handstand Hold

Remember, the most important thing is maintaining open shoulders. If you start to sag you are defeating the purpose of this drill and you should instead work to accumulate the assigned time.

Skills and Drills
3×6 Pull-Up Pull-Overs DEMO
Side note- this is the precursor for backward rolls to support on rings.