"Make the player be able to crawl"

-- local script 
local player = game:GetService("Players").LocalPlayer
local character = player.Character or player.CharacterAdded:Wait()
local humanoid = character:WaitForChild("Humanoid")
local UserInputService = game:GetService("UserInputService")
local isCrawling = false

local function toggleCrawl()
    if isCrawling then
        isCrawling = false
        humanoid.WalkSpeed = 16
        humanoid.JumpPower = 50
        character.HumanoidRootPart.Anchored = false
        character.HumanoidRootPart.CFrame = character.HumanoidRootPart.CFrame + Vector3.new(0, 1, 0)
    else
        isCrawling = true
        humanoid.WalkSpeed = 6
        humanoid.JumpPower = 0
        character.HumanoidRootPart.Anchored = true
        character.HumanoidRootPart.CFrame = character.HumanoidRootPart.CFrame - Vector3.new(0, 1, 0)
    end
end

UserInputService.InputBegan:Connect(function(input, gameProcessedEvent)
    if input.KeyCode == Enum.KeyCode.C and not gameProcessedEvent then
        toggleCrawl()
    end
end)