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Endurance sports tend to use blood doping such as
- cycling
- marathon running
- cross country skiing
this is because the increase of red blood cells in the body provide more oxygen to the muscles which then reduces athletes fatigue and less tiring of the muscles (lactic acid)

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-swimming
-cycling
-skiing
-marathon runners

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the injection of oxygenated blood into an athlete before an event in an attempt to enhance athletic performance

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Can be difficult to detect as no synthetics are used that can be measure in the blood.

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Pros; increase muscle mass, increase strength, offers the feeling of confidence and positivity when performing, increase aggressiveness, increase muscle definition and leanness, and helps the athlete to perform for longer

Cons; can get infection through others' blood, exposure to cardiovascular diseases, increase risk of cancer, cardiovascular, lung, and kidney diseases, aching joints, exposure to muscle tears and injuries

can increase the athlete's performance by 10% (especially in endurance sports)

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increase risk of;
- heart diseases
- stroke
- heart attack
- blood clots

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Blood doping was banned by WADA (The world anti doping agency) in 1985

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By increasing the number of red blood cells, blood doping causes the blood to thicken. This thickening forces the heart to work harder than normal to pump blood throughout the body. As a result, blood doping raises the risk of blood clot