I believe crunches are the best for building physical strength, although the rest also do help.
Explanation: Well, A healthy balanced diet will help you build strong bones from an early age and maintain them throughout your life. You need sufficient calcium to strengthen your bones and vitamin D to help your body absorb calcium. The bones become porous and fragile, the skeleton weakens, and the risk of fractures greatly increases. ... In younger and older adults, a nutritious diet helps preserve bone mass and strength. And in those who have had a fracture, it speeds and aids recovery and reduces the risk of having another fracture.
The answer would most likely be joking
