Damn! After today's (almost 3 hrs) workout I'm ready to suggest the following. In order to find instant, but good muscle pain follow these steps:
- Neglect the majority of core exercises during the next 2.5 years.
- Neglect all of the possible stairs exercises (jumps, running) during the next 2.5 years.
- When the steps 1 and 2 are achieved, do 2 hours intense workout including both stairs and core exercises.
- Enjoy the gooooood pain.
Results may vary.