Question: where does a boxer's power come from
[{'answer': 'kinetic energy', 'provenance': [{'wikipedia_id': '3525644', 'title': 'Punching power', 'start_paragraph_id': 1, 'start_character': 32, 'end_paragraph_id': 1, 'end_character': 46, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '3525644', 'title': 'Punching power', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 286, 'bleu_score': 0.8810810498603571, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 4313913476664588129}, 'section': 'Section::::Abstract.'}]}]