Rock climbing shoes are designed to be worn without socks, to have as little wiggle room and dead space in them as possible. Socks can cause your feet to slip and move around a little bit inside of the shoes, which could reduce your performance.

Most climbers don't wear socks with climbing shoes, but many do. If your shoes are a little bit too big, a thin pair of socks can help fill in that extra dead space. A thin pair of socks can also help reduce friction in new climbing shoes, which could help reduce blisters and other sore spots.

To mention rental shoes, while I have never worn rental shoes and will chose to never wear them if I have the choice due to not wanting to wear something so many sweaty and stinky feet have been in, socks could be a great choice. If you are like me and are more than slightly grossed out by rental shoes, wearing socks can give an nice extra layer between you and the shoes.

Jason Momoa is an avid climber. He has been climbing since he was a teenager. The main discipline that he loves is bouldering, as that is also what he started with.

He isn't a stranger to sport climbing either, he has climbed in various locations around the world, including Yosemite National Park. Momoa has talked about how climbing helps him stay physically and mentally fit, and he encourages others to try it too.

He has also incorporated his love of climbing into his acting career by staring in a new docuseries on HBO Max called "The Climb", which he stars alongside his friend Chris Sharma, one of the greatest climbers in the world.

There are a few videos on his YouTube channel specifically about climbing, which further show his love for the sport.

It's great that someone with such an influence like him is able to introduce the sport of climbing to more people.

As a seasoned climber, I can tell you that both core strength and back strength are crucial for climbing performance, but they serve slightly different purposes.

Core strength is essential for maintaining body tension and control on the wall. It helps you stabilize your body and transfer energy efficiently through your limbs, allowing you to climb more efficiently and with better balance. A strong core also helps to reduce the risk of injury and can improve overall climbing endurance.

Back strength, on the other hand, is important for pulling and lifting your body weight. A strong back helps you engage your shoulders, arms, and upper body more effectively, allowing you to perform difficult moves and hold difficult body positions. It also helps prevent back injuries and improves overall posture, which is essential for climbing.

While both core and back strength are important, developing a strong core should be a priority for any climber. By doing specific core exercises such as planks, sit-ups, and leg raises, you can build the stability and control needed for efficient climbing. However, it's important to maintain a balance between both types of strength and incorporate exercises that target your back muscles as well.