This is from like 2 days ago but I wasn’t getting International Matt Harvey Alerts lol. A good interesting read here via the OC Register.
Matt Harvey was hooked up to a pair of 4D Motion sensors – a wireless system that uses a pair of wearable devices to produce a digital representation of an athlete’s body in motion. Harvey wore one strap over his shoulders, and another around his waist, while throwing off the mound Friday. The two straps measure when a pitcher’s hips accelerate, and by how much; when his arm accelerates, and by how much; and also how the two measurements relate to each other.