The development of advanced ring strength skills always begins with mastering the basics. Attempting advanced ring strength elements (iron cross, maltese etc.) without properly building an adequate foundation will always result in failure and/or injury.
One of the simplest ring strength series that I begin my introductory athletes with follows below. Generally for introductory athletes, this series will require a great deal of hand-spotting on my part. It is also important to note that only the bare minimum of assistance necessary should be provided, the athlete should substantially struggle during the execution of this series; while simultaneously being required to attempt perfect execution.
BASIC RING STRENGTH 1:
Muscle-up to support (strongly emphasize chest up, arm straight and elbows locked during the support), roll backwards from support to a back lever, pull out to inverted hang, lower to a front lever, pull out to inverted hang.
Each time through the series should be regarded as a single "set". I recommend performing 2-3 sets of this series for introductory athletes.
Intensity can be increased by increasing the number of repetitions per movement within the series; for example performing up to 3 muscle-ups, or 3 back levers or 3 front levers. It is not necessary to perform the same number of repetitions with all of the internal elements within the series. For example, if the current emphasis is on developing a stronger back lever for the athlete, then perhaps 3 back lever pulls are performed with the other elements remaining at one repetition.
Intensity on the levers may also be increased by requiring a hold time on each repetition of up to 10 seconds, although 5 seconds is closer to my general required norm.
The Xtreme Rings which have been responsible for building a great deal of this athlete's strength are available here.
Yours in Fitness,
Coach Sommer