How can free runners extend the time of impact when they land on the ground after jumping long distance

By leaping.

Explanation:

When free runners run, they also leap. They do this so they can get more distance and air time. Leaping will allow them to get more distance per jump.

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it is given that trillions of microbes make up to 1% to 3% of the body mass.

let's take average of this percentage: 2%

consider the average mass of the human body as 70 kg.

then, trillions of microbes would have mass  

therefore, 100 trillion micro-organisms would weigh:

this is an approximate value and could change depending on the mass of the human body and percentage of the microbes present in it.

average mass per microorganism =