It’s research in its infancy but one small study found when wrestlers received supplements of omega-3 fats during training, their lung function improved*.

And oily fish are one of the richest dietary sources of omega-3 fats.

* Ref: Tartibian, B et al (2010) The effects of omega-3 supplementation on pulmonary function of young wrestlers during intensive training. Journal of Science & Medicine in Sport/Sports Medicine Australia 13 92), 281-286.