Nails can become altered by a variety of physical activities. Runner’s nails are often thick and even black.
+ The black color is from blood or bruising. Many sports cause trauma to the nail from sudden stopping, sliding and stopping.
+ Onychomycosis is a nail fungus and can be picked up in gyms.
+ Wear shoes that fit well and consider anti-fungal creams or powder on the feet to prevent fungus.