Overconsumption of vitamin A can cause rashes, headaches, drowsiness, nausea, irritability and problems in muscle coordination. When symptoms develop it would be best to decrease your intake of vitamin a supplements for at this point it does more harm than good. Unlike vitamin a, overconsumption of vitamin c only leads to excess to leave the body through fluids. Still it is better to maintain balance intake to avoid any health problem.
Since someone would be performing wind sprint activities, it is guaranteed when performing any activity is to get better overtime so I would say to "work above your target heart rate"
