Exercise, in the long run, among other healthy lifestyle interventions, has been shown to improve blood fluidity, cardiovascular risk, and risk for developing metabolic diseases in adults. Conversely, immediate exercise-induced impairments of blood viscosity are often experienced due to dehydration, stress, and oxygen demand, among other factors. Young people and adults may experience similar short-term changes in blood flow as a result of submaximal aerobic exercise, according to a 2013 study published by a team of researchers in Valencia, Spain. While previous studies have demonstrated exercise-related impairments of blood fluidity in adults, not much was known about its effects in younger populations. Romagnoli et al. demonstrated significant increases in hematocrit (p < 0.05) and plasma viscosity (p < 0.05) in 10 young subjects (aged 12-16 years) after 1 hour of submaximal aerobic exercise. It is likely that young people, like adults, will receive long-term improvements in blood viscosity as a result of regular exercise.