Script

local Humanoid = script.Parent:WaitForChild("Humanoid")
local shiftKeyDown = false
local defaultWalkSpeed = Humanoid.WalkSpeed
local sprintSpeed = 32 -- Adjust this value to set the sprint speed

-- Function to handle when the shift key is pressed down
local function onShiftDown()
    shiftKeyDown = true
    if Humanoid and Humanoid.WalkSpeed > 0 then
        Humanoid.WalkSpeed = sprintSpeed
    end
end

-- Function to handle when the shift key is released
local function onShiftUp()
    shiftKeyDown = false
    if Humanoid and Humanoid.WalkSpeed > 0 then
        Humanoid.WalkSpeed = defaultWalkSpeed
    end
end

-- Function to handle when the humanoid's WalkSpeed changes
local function onWalkSpeedChange()
    if shiftKeyDown and Humanoid and Humanoid.WalkSpeed > 0 then
        Humanoid.WalkSpeed = sprintSpeed
    end
end

-- Bind the shift key events
game:GetService("UserInputService").InputBegan:Connect(function(input)
    if input.KeyCode == Enum.KeyCode.LeftShift then
        onShiftDown()
    end
end)

game:GetService("UserInputService").InputEnded:Connect(function(input)
    if input.KeyCode == Enum.KeyCode.LeftShift then
        onShiftUp()
    end
end)

-- Bind the WalkSpeed change event
Humanoid:GetPropertyChangedSignal("WalkSpeed"):Connect(onWalkSpeedChange)