Why did this athlete get muscle cramps after his running race ?

Athelete suffer cramps when they participate in running race. This is due to

Observe the following graph and answer the questions given below . Why oxygen deficit in muscles of running Athlet ?

The sports man who participated in 100 mtr. Race get more muscle pains. But the sports man who participates in 5 km's race get less muscle pains. What is the reason ?

What did Galen conclude after his observations?

Why did people also suffer from various disease after consuming fishes living in local water reservoir?

Why did we feel thirstier, after eating 50 gms of potato chips in journey?

Rain is falling vertically with a speed of 20 ms^(-1) A person is running in the rain with a velocity of 5 ms^(-1) and a wind is also blowing with a speed of 15 ms^(-1) . (both from the west). The angle with the vertical at which the person should hold his umbrella so that he may not get drenched is:

Why lactic acid is formed in the muscles of athletes which causes severe pain ?

Why did the colour of the phenolpthalein in NaOH solution change after adding the HCl solution ?