No situps required. Just copy this for massive core strength (and 6 pack).
This is better than HIIT (Spain Indoor Katas)
STOP doing Pullups. Do these 3 moves instead (for Superhero Shoulders).
You MUST do these 3 moves for CORE (or never have strong abs).
You MUST do these 5 moves EVERYDAY (or never master your bodyweight).
1 Mindset Shift turns any age into Bodyweight Legend
3 Dynamic Moves You Must Do (or NEVER gain Total Body Strength)
The Missing Progressions To Your Training
ALL the Moves You're NOT Doing (Leg Power)
Arab Knife Juggler, Hadj Cheriff (1894 Original Black & White Film)
Revelatione
It's FOOLPROOF (but it hurts)