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 .

Question: What may be the reason they know it 's hard work for their core ?
Answer: None of the above choices .Because someone told them it is .Because they are feeling stronger .Because their appetite has increased .