How Do You Calculate Force with Mass, Height, and Distance?

[twadd]

Homework Statement

Scenario: Bob (73kg) steps off a 1-meter high platform and properly absorbs the fall with bent legs in a squat position.

Question: How much counterforce required to slow the impact to a stop without Bob's legs going past 45 degrees?

I am trying to figure out how much someone would need to squat in a weight gym setting to be able to safely absorb impact from height. I have little to no experience in physics /: but I could not find anything online that was specific.

Relevant Equations

I have no equations because that's what I am trying to figure out.

I apologize for my lack of knowledge or helpful information! If there is any other information needed let me know! Thanks, guys and gals!
Referencing drawing:

 

[BvU]

Hello twadd, $\qquad$ $\qquad$ !

I have no equations

You need some. What have you learned so far that might apply ?
And: make an educated guess about the given "without Bob's legs going past 45 degrees"
(Hint: In the sense of 'how long is the stopping trajectory')

 

[haruspex]

Relevant Equations: I have no equations because that's what I am trying to figure out.

"Relevant Equations" here means standard equations that you have been taught and may be relevant to the problem.
You have a mass falling through a height, force, and the distance Bob through which the force applies as Bob bends his legs. What physical quantity relates these?