How to make HumanoidRootPart move to a destination and loop that using BodyPos?

So I cant get HumanoidRootPart of a localplayer to move to a destination, and whats supposed to happen is when it reaches the destination it loops going to the destination over and over.

So how would I make the player go through blocks while heading to its destination. Like with Body Position but it doesnt work for me. ;(

local start = workspace.Model.start
local humanoid = game.Players.LocalPlayer.Character.HumanoidRootPart
local bodypos = Instance.new("BodyPosition",game.Players.LocalPlayer.Character.HumanoidRootPart)
local finish = workspace.Model.finish

while true do
    bodypos.Position = start.Position
    wait(2.5)
    bodypos.Position = finish.Position
end

Idk but it doesnt work for me pls help