How do I knock over an NPC or player in a natural way?

I want the punch to knock someone over. But this is what I use and it looks very rough. What is a more natural way to knock a player or character down like this?

HitChar:SetPrimaryPartCFrame(CFrame.new(HitChar.PrimaryPart.Position)*CFrame.Angles(math.pi/2, 0, 0))

I also tried this in a Server script:

local HitHumanoid = HitChar:FindFirstChild("Humanoid")

HitHumanoid:ChangeState(Enum.HumanoidStateType.Ragdoll)
wait(2)

HitHumanoid:ChangeState(Enum.HumanoidStateType.GettingUp)

I made a punching ability, but it's missing one feature. Knocking the players/NPC's over when I punch them. How do I knock over players?

PlatformStand is out of the question, because I want to knock players over not float them through the floor.

Ok, I may have said what PlatformStand does incorrectly. Sure, it does make the character go through the floor, but you could try finding a way to then make it push over so it doesn't go through the floor and thus, gives you the result you want.

Here is a link to a demonstration of how PlatformStand works (sorry for bad quality):

https://media.giphy.com/media/RGpOKyLl22ZT26jUQu/giphy.gif

Otherwise use the sit value and knock the player/NPC over.