Test colission

local player = game.Players.LocalPlayer
local character = player.Character or player.CharacterAdded:Wait()
local humanoidRootPart = character:WaitForChild("HumanoidRootPart")

local PhysicsService = game:GetService("PhysicsService")

local collisionGroupName = "Players"
local newCollisionGroupName = "5"

if not PhysicsService:GetCollisionGroupName(newCollisionGroupName) then
    PhysicsService:CreateCollisionGroup(newCollisionGroupName)
end

PhysicsService:SetPartCollisionGroup(humanoidRootPart, newCollisionGroupName)

PhysicsService:CollisionGroupSetCollidable(collisionGroupName, newCollisionGroupName, false)