Strength accessory work. A basic superset, moving from one exercise to the next sequentially for 4 Rounds. Rest as needed. The alternating toes 2 bar is simple a scissor kick, don't overthink it, yes its strict. Ball up refers to a straight arm hang from the bar without bending the elbows roll up to support. As in hips in line with arms. German hang is the most complex movement in todays work and frankly should not be attempted if you have less than ideal extension of the shoulder. A german hang is the full unsupported hang of a "skin the cat". For each rep pause at the hang and pull back up to ball up.
A1: 4x12 Alt single Leg T2B
A2: 4x8 Ball up
A3: 4x4 German Hang to Inverted Hang