Wood bats have smaller sweet spots than metal and composite bats. Using a wood bat in BP will make the sweet spot on your metal/composite bat seem huge. You can purchase both youth and adult wood bats with varied weight/length ratios. A few onces heavier than the game bat is good to build up muscles related to bat swing. I usually recommend taking half BP with wood then the last half with metal/composite. You can get a good wood bat for under $50... give it a try!