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Since this time, there has been an explosion in the utilization of altitude, as well as the supporting science, in the preparation of elite athletes for competition (Mujika et al., 2019).
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The implementation of altitude training to optimize elite athlete performance rose to prominence prior to and during the 1968 Mexico City Olympics (held at 2,250 m above sea level).
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You do get charged 7.99 if you return an item unless your a member so when the membership was on sale for $10 bucks I jumped on it and it's already paid for itself many times as I didn't lose that $7.99 for several returns. I personally have never had a major issue with shipping besides a delay of a few days but it's understandable with everything going on. I have ordered from Altitude Sports many times, the last time being over boxing week. Have used them many times and will continue to do so!