In reply to Yorkieboy:
There are several basic movements to master with bodyweight training to build general strength. A few of which can be paired for time efficiency (along the lines recommended by Steve Lowe in Overcoming Gravity):
L-Sits/Manna & Handstands
Planche & Front Lever
Back Lever
Pistols/Squats
Apart from the last two, the rest can be performed on rings but will take years to develop. Several progressions/variations are around to help you get there. As well as Overcoming Gravity I'd recommend Building the Gymnastic Body by Chris Sommer (and his Foundation 1 strength course).
Post edited at 20:34