sh_128170_01.lua

local UIS = game:GetService("UserInputService")
local character = script.Parent
local humanoid = character:WaitForChild("Humanoid")
local animator = humanoid:WaitForChild("Animator")
local hrp = character:WaitForChild("HumanoidRootPart")
local isCrouching = false
local defaultWalkSpeed = 16
local defaultJumpPower = 13

local deb = false

local StandToCrouchNoLegs = animator:LoadAnimation(script:WaitForChild("StandToCrouchNoLegs"))
local StandToCrouch = animator:LoadAnimation(script:WaitForChild("StandToCrouch"))
local CrouchWalkAnim = animator:LoadAnimation(script:WaitForChild("CrouchWalkAnim"))
local animateScript = character:WaitForChild("Animate")
local defaultWalkAnim = animateScript.walk.WalkAnim.AnimationId
local defaultRunAnim = animateScript.run.RunAnim.AnimationId
local defaultIdleAnim1 = animateScript.idle.Animation1.AnimationId
local defaultIdleAnim2 = animateScript.idle.Animation2.AnimationId

local function crouch()
  isCrouching = true
  
  StandToCrouchNoLegs:Play()

  animateScript.walk.WalkAnim.AnimationId = "rbxassetid://8125946204"
  animateScript.run.RunAnim.AnimationId = "rbxassetid://8125946204"
  animateScript.idle.Animation1.AnimationId = "rbxassetid://8141361463"
  animateScript.idle.Animation2.AnimationId = "rbxassetid://8141361463"
  
  humanoid:ChangeState(Enum.HumanoidStateType.Landed)
  
  while humanoid.WalkSpeed > 6 do
    humanoid.WalkSpeed = humanoid.WalkSpeed - 1
    wait(.1)
  end
  humanoid.JumpPower = 0
end

local function stand()
  isCrouching = false

  animateScript.walk.WalkAnim.AnimationId = defaultWalkAnim
  animateScript.run.RunAnim.AnimationId = defaultRunAnim
  animateScript.idle.Animation1.AnimationId = defaultIdleAnim1
  animateScript.idle.Animation2.AnimationId = defaultIdleAnim2

  humanoid:ChangeState(Enum.HumanoidStateType.Landed)

  -- Stop the crouching animation
  StandToCrouchNoLegs:Stop()
  
  while humanoid.WalkSpeed < defaultWalkSpeed do
    humanoid.WalkSpeed = humanoid.WalkSpeed + 1
    wait(.1)
  end
  humanoid.JumpPower = defaultJumpPower
end

UIS.InputBegan:Connect(function(input, isTyping)
  if input.KeyCode == Enum.KeyCode.C and isTyping == false then
    if deb == false then
      if isCrouching == false then
        deb = true
        crouch()
        wait(.2)
        deb = false
      else
        deb = true
        stand()
        wait(.2)
        deb = false
      end     
    end
  end
end)