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But the ban has now been lifted after the RAF Centre of Aerospace Medicine carried out tests in an altitude chamber and the teacakes did not explode.

First they were put into an altitude chamber - normally used in the training of new fast jet pilots - and were lifted to 8,000ft, climbing at 4,000ft per minute,

Altitude chamber tests show that the body absorbs more oxygen into the blood this way, and passengers experience fewer headaches and less fatigue.

Part of the money will go toward an altitude chamber — an enclosed weight room area with cardio equipment for players to train for play in higher altitudes.

So he focused his training more on conditioning, sparring 12 full rounds at a time and even working out in an altitude chamber that mimics conditions at 13,000 feet.