Yups, that my primary intentions to begin with. To build my endurance and stamina. I better hit the the gym and lift if  i want to build a muscle and strength. I think later i will add swimming in my trainings but not untill at least i can run around 20km. Currently 7 km is my limits. Btw after one months, my current limits is 15 chin up, 12 pull ups, 12 dips and i rarely doing push ups nowadays.
Owh, finaly my 6 pacs is visible....

12 reps per set in perfect form possible ( not using body or legs momentum and my chin over the bar ).  after that start to run (3 - 7 km), rest for a while and re do for second set until failure.
Just like i mentioned before, my target is 25 reps perset after a year. dunno achievable  or not. life's getting busier.  already 4 months in this body weight training things.
its not that i exercises everyday btw. 3 or 4 times per week and sometimes less.

25 reps per set are still normal compare to  the suggestion from an article about crossfit i read before on bb.com, 100 reps per set

Just do the max reps and try until your overvcome the limits.
Actualy i never set the limit,  12 reps perset is my average, sometimes less and sometimes more, i just immitate what the crossfit guys do, do it until vomit( literally).
Sorry if i sound like bragging myself out.
Try search and watch youtube video from athleanx,  how to do more pull ups.
Currently on mobile, cannot link the video...

The initial part where you do a hanging leg raise to get the backwards kick. I only can raise my legs like 60 deg

See, the problem is I can't "train" this. My hamstring locks up at around 60 Degree. I stretch how much also it like doesn't improve beyond this 60ish degree.