It is like suddenly being super strong LOL . The feeling wears off after a while and I imagine it is just the nervous system adjusting after swing the heavy object around . What I ca n't get over is how hard the work is for my core .
According to the above context, choose the best option to answer the following question.
Question: What may be the reason they know it 's hard work for their core ?
Options:
- None of the above choices .
 - Because someone told them it is .
 - Because they are feeling stronger .
 - Because their appetite has increased .


None of the above choices .