in this video I will show you how to make shift to SPRINT very easy to do
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script:
local Player = game.Players.LocalPlayer
local Humanoid = Player.Character.Humanoid
local ShiftToRun = false
local OriginalWalkSpeed = 16 This is is what the players walkspeed will be on default
local RunningWalkSpeed = 32 Change this to whatever you want the players walkspeed to be when they click shift.

local function onKeyPress(input)
if input.KeyCode == Enum.KeyCode.LeftShift then
ShiftToRun = true
Humanoid.WalkSpeed = RunningWalkSpeed
end
end

local function onKeyRelease(input)
if input.KeyCode == Enum.KeyCode.LeftShift then
ShiftToRun = false
Humanoid.WalkSpeed = OriginalWalkSpeed
end
end

game:GetService("UserInputService").InputBegan:Connect(onKeyPress)
game:GetService("UserInputService").InputEnded:Connect(onKeyRelease)

links:
rolbox pfp: https://www.roblox.com/users/34185316...
roblox group: https://www.roblox.com/groups/3330250...

Thank you!!