What weight medicine ball should I buy?

Reddit threads we read give a wide range. r/homegym discussions suggest beginners who already lift often start at 10–15 lb, while a 20 lb slam ball is enough to gas out most users in a few minutes. For CrossFit-style wall balls, the RX standard cited in r/crossfit is 14 lb for women and 20 lb for men, with Hyrox using lighter 9 lb/14 lb loads. If in doubt, buy a line that's sold in multiple weights so you can scale up.