The UFC’s new partnership with the U.S. Anti-Doping Agency (USADA) went into place on July 1. Details are still being unpacked, but one aspect of the new oversight is a ban on the use of IVs for rehydration.

Many fighters use an IV for rehydration purposes immediately after weigh-ins. In some instances, the method is the safest way for athletes to recover and compete effectively after large weight cuts, which are commonplace in the sport.

The official ban doesn’t go into place until October because of the unfair impact it would have on fighters already scheduled to compete. However, that hasn’t stopped athletes from voicing displeasure with the newly implemented rules.

One former fighter and soon-to-be UFC Hall of Famer doesn’t have any problem with the new rules, though. Former two-division UFC champ B.J. Penn (16-10-2 MMA, 12-9-2 UFC) revealed on Twitter that he supports the IV ban and hopes it changes the culture of how athletes cut weight.

I love the new PED and IV ban in the UFC. I never took an IV in my life after a weigh-in. IVs are for wimps! #BeerAndHotDogs — BJ PENN (@bjpenndotcom) July 6, 2015

It's the biggest joke ever. If you aren't sticking needles in your arm to fight the guy gets a 15 pound advantage. #FightLikeAMan — BJ PENN (@bjpenndotcom) July 6, 2015

While the IV ban will have a huge impact for fighters that are accustomed to the rehydration method, fighters who don’t use IVs, like Penn, may now be at an advantage.

Penn was notorious for his willingness to fight at any weight throughout his 13-year career. His retirement bout this past July took place in the featherweight division, but prior to that “The Prodigy” tested his skills at lightweight, welterweight and even an open weight fight in which his opponent was classified as a heavyweight.

The 36-year-old is no longer an active member of the sport, but that doesn’t stop him from voicing his opinion on certain subjects. This was one of them, and Penn had no problems labeling athletes that complain about the ban as “wimps.”

Penn will be inducted into the “modern era” branch of the UFC Hall of Fame this Saturday prior to UFC 189 as part of the UFC International Fight Week festivities in Las Vegas.

For more on UFC 189, check out the UFC Rumors section of the site.