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Billaut, François. “A Higher Calling, but Does Altitude Training Work?” The Conversation, The Conversation, 18 May 2018, theconversation.com/a-higher-calling-but-does-altitude-training-work-3055.

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Peterson, Dan. “Why Do Athletes Train at High Altitudes?” LIVESCIENCE, Life's Little Mysteries Contributor, 9 Aug. 2010,
https://www.livescience.com/32750-why-do-athletes-train-at-high-altitudes.html

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This source is reliable as it includes testimonies from trusted associations such as the World Anti-Doping Agency, or the WADA, and real life sports teams that have actually sent athletes to higher altitudes in order to increase anaerobic capacity
C: Very recent ,2018 so information is still current
R: Relevant as it mentions the properties of the respiratory system  that is affected in altitude training.
A: Information matched other sources suggesting that the information is accurate.
A: The writer is Billaut, François, he has a Ph.D. in Exercise Physiology, and is a credible writter
P: The purpose of this piece is to educate readers, so it is a trustable purpose.

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lack in the amount of oxygen reaching the tissues in higher altitudes - used as stimulus to training to enhance performance in sea level.

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This source is reliable because it uses a research from a journal Proceedings of the National Academy of Sciences. Furthermore, as this source was published in 2010, it is reliable

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De Neef, Matt. “Explaining the Science of Altitude Training.” CyclingTips, 6 Mar. 2013, cyclingtips.com/2013/03/explaining-the-science-of-altitude-training/.

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Sinex, Jacob A. Sinex, and Robert F. Chapman. “Hypoxic Training Methods for Improving Endurance Exercise Performance.” Egyptian Journal of Medical Human Genetics, Elsevier, 23 July 2015, www.sciencedirect.com/science/article/pii/S2095254615000836.

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Although incorporating real life examples such as experts in the field, this is published on a cyclist blog, and written by a cyclist, not an expert on the science.
Although the background knowledge seems to match other credible sources, it might be risky to fully trust
C: This piece was published in 2013, so it is still current, yet some information may be outdated.
R: It is relevant as although it talks primarily on the effects it has on cyclists, it talks about the effects altitude training has on athletes.
A: Information matches other credible sources, suggesting that it is accurate.
A: This piece is by Matt De Neef who is a cyclist. He is not the most credible author.
P: Purpose is to inform specifically cyclists on altitude training. It is still a trustable purpose.

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This source is reliable because it is an extract from Journal of Sport and Health Science written by Jacob A. Sinex and Robert F. Chapman published by Shanghai University of Sport.

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Became popular in 1968 after the Mexico Olympics game that was at an altitude of 2,300 meters.
Difficult to maintain intensity of training due to hypoxia. Does not improve physical ability as much and is more recommended for sports in high altitudes.

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There are evidence that living at altitude and training low is the most beneficial method for improving performance at sea level. However not practical as the person needs to go back and forth between high and low altitudes. Can use mask to gain same effect.

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Combination of training and hypoxic exposure is more beneficial than training at sea level. Intensify physical effort however no study report improvement in red blood cell volume, VO2max and endurance performance.

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Have to consider physical demands of the sport. Some sports do not benefit from altitude training and is not worth the money spent.

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Grimes, Gerlinda. "How High Altitude Triathlon Training Works." howstuffworks.
https://adventure.howstuffworks.com/outdoor-activities/triathlons/training/high-altitude-triathlon-training2.htm

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Training at high altitude aim to produce extra red blood cells and take advantage of changed physiology.

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This source is not really reliable because it does not show the date it was published and where the information came from.

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https://www.myprotein.com/thezone/training/what-is-high-altitude-training-benefits-endurance-athletes/