Selenium is an essential micronutrient with antioxidant activities in different cells. Although many studies have suggested that selenium has protective effects in tumor development, the results of some studies are somewhat controversial and have shown that selenium supplementation becomes a prooxidant and shows toxicity effects in cancer. Also, physical exercise can act as a coadjuvant in cancer therapies, in addition to its positive effects on the physical and psychological complications of cancer and related therapies; it can affect cancer cells and the tumor microenvironment. Physical exercise affects the cancer cells metabolism, prevents cancer cachexia, and induces metabolic adjustment in different tissues in cancer. The metabolic eff

Military forces based on their mission have to deployment and executed military operation in extreme environmental conditions, they simultaneously experience nutritional and sleep disorders and endure mental stress. This condition plays essential role in body hemostasis, military fitness components and finally commanded mission's success. Neglecting above mentioned condition physiological responses, as long as providing nutritional, training, and motivational needs could be health compromising, reduce productivity and finally led to operations failure. Various insight presented regards fronting these stressful environment induced disorders; it seems, investigating physiological responses to military environment stress, based on its specific

The novel coronavirus severe acute respiratory syndrome coronavirus 2 (SARS-CoV2) which caused COVID-19, is a pandemic that threatens human societies in many ways. It seems that the main strategy of managing coronavirus at present is to prevent infection. In addition to improving physical fitness, moderate-intensity exercise boosts the cellmediated and humoral immune system responses, especially in people with weakened immune systems who are at risk of coronavirus implications such as the elderly, obese people and those with chronic diseases. Therefore, performing regular exercise during life span can be considered as an effective strategy to prevent viral diseases such as COVID-19. On the other hand, home quarantine and non-use of public s