Vitamin D3 supplementation boosts the immune system or get 30 min of full sun half naked. I have seen the incidence of colon cancer plotted on a US map which shows more incidence in the northeast.
Supplementation with resverotrol.

Sprinting tabata wind sprint style.

Edit: Now that I see you are in Canada...Vit D3 is even more important.

Vitamin D3 supplementation boosts the immune system or get 30 min of full sun half naked. I have seen the incidence of colon cancer plotted on a US map which shows more incidence in the northeast.

Supplementation with resverotrol.

Sprinting tabata wind sprint style.