Jack Osbourne, the 19-year-old son of rocker Ozzy Osbourne is extremely happy with his newfound fitness and he has been training to climb a 3,593-foot (1,095 meters) monolith.

Jack has lost almost 15 kilograms in the past four months, due to his thrilling hobby.

Earlier this month, the Osbourne kid has successfully scaled a mountain in the south of France, which makes him feel ready for climbing Yosemite National Park's El Capitan.

"I feel bulletproof. You have to be in top condition to do El Cap", Jack said.