John Dennis I use a Gorilla pod Tripod from Joby which has flexible legs, so you can spread them out for stability or wrap them around a rail or post etc.
Note that there are cheaper knock-off copies out there, but they tend to be of poor quality and may break or fall apart.
Commented on This time I worked a bit on backside ...
07 Aug 07:49
From the video clip that Michiel posted, look at the difference between the arm positions.
Notice how Ozzi on the right is lifting his elbows and pointing towards the "lip", whereas Michiel has his hands low.
You're doing something similar, your coffee cup arm is hanging down and trailing behind you instead of being forward as if you're trying to swing around a pole at the centre of the arc of your turn.