This summer I hiked with my brother in small mountains but he was slower than me so I had to stop once in a while to wait for him. The next day we went for a bigger mountain and the problem became even bigger cause he had sore muscles from the previous hike. I had to wait for him very often and even take 0.5 l of water from his backpack because of his backache. Summiting the mountain took us about 30% longer than it's supposed to.

The difference between us is that I love running and I'm skinny while he hates running and is skinnyfat.

So how do I make him hike faster? Should I encourage him to run at least for a few days before a trip to the mountains so his legs don't get sore from being used?