Help with body velocity/animation function! [?]

I have this if statement inside of a function and its supposed to make you do a side flip, but it only flips you on the x axis. Let's say you are facing the x axis, the animation would make you flip sideways, but you would be going forward, I want to know how I could make the body velocity change relative to the characters torso. what's going on

if char and char.Humanoid then
		local anim = char.Humanoid:LoadAnimation(char:FindFirstChild("LJumpAnim"))
		anim:Play()
		local bodyVelocity = Instance.new("BodyVelocity",char.Torso)
		bodyVelocity.Velocity = Vector3.new(-15,-1,0)
		bodyVelocity.MaxForce = Vector3.new(math.huge,math.huge,math.huge)
		wait(1.3)
		bodyVelocity:remove()
		debounce = true
	end

Help is appreciated

bodyVelocity.Velocity = Vector3.new(-15,-1,0)

You're setting the velocity to a world coordinate, its like telling someone to do a flip towards north. No matter where you're facing you'll always move towards north. You have to offset it from the players position/direction.

bodyVelocity.Velocity = char.Torso.Position + Vector3.new(-15,-1,0)

I don't know if that will work since i'm not very good with vectors, but it's supposed to be something like that.