Downhill mountain biking (DRTBKS) is an adrenaline-fueled sport that has gained popularity in recent years. It's not for the faint-hearted, as it involves riding down steep, rough terrain at high speeds. Though it's exhilarating and enjoyable, it's also one of the most physically demanding and risky forms of mountain biking. Thus, it requires training, the right gear, and a strong understanding of the sport.

One of the first things you need to know is that DRTBKS is different from other types of biking. Unlike cross-country riding where you ride on flat, smooth terrains, downhill biking focuses on steep descents. The routes that downhill mountain bikers use are often laden with obstacles such as roots, rocks, ruts, jumps, and even drop-offs. It’s no surprise that it's considered as an extreme sport.

Since downhill mountain biking is a perilous variation of the sport, it's essential to wear the right protective gear. This includes a full-face helmet, gloves, goggles, body armor, knee pads, and elbow pads. The bike itself also needs to be equipped for the adventurous ride. Downhill bikes are specially designed with full-suspension and larger, more robust frames to absorb the impacts of rough terrain.

To participate in this sport, one has to maintain a high level of fitness. It's physically demanding which involves upper body strength to control the bike over obstacles and lower body strength for pedaling. Balance and coordination also play a vital role, as riders have to navigate their bikes down tricky terrains and around sharp turns.

One tends to think the difficulty in DRTBKS lies in speeding downhill. However, controlling the speed often proves to be more challenging. Experienced riders will tell you that the secret to a successful downhill run is knowing when to speed up and when to slow down. It’s about understanding the course and controlling your bike in a way that maintains momentum, without risking safety.

In DRTBKS, line choice is everything. To the uninitiated, this may not seem significant, but knowing the most effective path down the hill is incredibly critical in this sport. Devising your line lies in making quick and precise choices about which path to take while ensuring you don't compromise on your speed or balance. It’s a combination of decision-making skills, spatial awareness, and making split-second decisions on which obstacles to avoid.

Training and practice are key when it comes to downhill mountain biking. One can start with mountain bike trail centers, which are great places to practice as they have a range of courses designed for different abilities. Each course will be graded in terms of difficulty. As a beginner, it’s good to start off with easier tracks before gradually upgrading to more challenging ones.

Beginners should practice more frequently and focus on mastering the basics before moving onto the more complicated parts of the sport. Improving your skills in handling, pedaling, and maneuvering your bike over tricky terrains should take priority.

It's also wise to consider joining a local mountain biking club or hiring a coach. The guidance and support provided by experienced riders can prove to be invaluable. You can learn from the experiences they share and benefit from their advice about tackling different terrains.

Downhill mountain biking is not just about the physical aspect, there's a mental side to it too. Mental preparation goes hand in hand with physical training. Riders must be able to overcome fear, remain focused and keep their composure in the heat of the ride. The ability to react swiftly and decisively to what's happening, while maintaining good control of the bike can be the difference between a successful run and a nasty spill.

In conclusion, downhill mountain biking is undoubtedly an extreme sport but with the right attitude, preparation, and gear, it's an exciting and thrilling experience that is both rewarding and fulfilling. It's able to test your limits and push past them, which only contributes to personal growth. Therefore, if you're looking for a sport that combines physical agility, quick-thinking, and tons of excitement, downhill mountain biking is definitely worth a try!