here is a graston type tool. they sell kits online for 100+ but this one is like $25 and will work fine on almost any body part. https://www.ebay.com/itm/174142500627 you can search for better deals or ones but this gives you an idea
here is an example of how it is done. not rocket science at all. you just scrape the skin and release the tension and get the blood flowing. instant relief https://www.youtube.com/watch?v=81b_-lxOI_0&ab_channel=ChrisDukarski,PT
and then here is a cupping kit i highly recommend too. this is a cheap $20 one but you can buy more expensive ones https://www.ebay.com/itm/24Cups-Vac...41b183237dc42671fce4|ampid:PL_CLK|clp:2334524
here is an example of how it is done. not rocket science at all. you just scrape the skin and release the tension and get the blood flowing. instant relief https://www.youtube.com/watch?v=81b_-lxOI_0&ab_channel=ChrisDukarski,PT
and then here is a cupping kit i highly recommend too. this is a cheap $20 one but you can buy more expensive ones https://www.ebay.com/itm/24Cups-Vac...41b183237dc42671fce4|ampid:PL_CLK|clp:2334524