Scripting Question on how to script humanoid is in motion or touching the ground?

My problem is that I have implemented a sprint script with an animation on it as well. However, my sprint animation continues even if I were to click another key for another animation to start.

I want to really know how I can write my keybind animation scripts so that they stop when I press another key with another animation so that ,that animation can start.. Also I want to know how to write a script that confirms that the humanoid is touching the ground and that they are in motion.

Please help and thank you!

Here is the code for my sprint animation. It is a remote event.

StarterPlayerScripts

local uis = game:GetService("UserInputService")

local toggleSprintEvent = game.ReplicatedStorage:WaitForChild("ToggleSprint")

uis.InputBegan:Connect(function(key, processed)
	if processed then return end
	
	if key.KeyCode == Enum.KeyCode.LeftControl then
		
		toggleSprintEvent:FireServer(true)
	end
end)


uis.InputEnded:Connect(function(key, processed)
	if processed then return end
	
	if key.KeyCode == Enum.KeyCode.LeftControl then
		
		toggleSprintEvent:FireServer(false)
		
	end
end)

ScriptServerService

local toggleSprintEvent = game.ReplicatedStorage:WaitForChild("ToggleSprint")

toggleSprintEvent.OnServerEvent:Connect(function(player, turnOnSprint)
	local char = player.Character
	local hum = char.Humanoid
	if not char:FindFirstChild("Humanoid") then return end
	
	if turnOnSprint == true then
		
		char:FindFirstChild("Humanoid").WalkSpeed = 50
		  local sprintAnim = Instance.new("Animation")
		
		   sprintAnim.AnimationId = 'rbxassetid://5150687024'
		
		  playAnim = char.Humanoid:LoadAnimation(sprintAnim)
		playAnim:Play()
	else
		char:FindFirstChild("Humanoid").WalkSpeed = 16
		playAnim:Stop()

	end
end)

I recommend you to read about HumanoidStateType. With this you can check if humanoid is falling, running, climbing, jumping, getting up or landed. Here is link for developer hub: https://developer.roblox.com/en-us/api-reference/enum/HumanoidStateType