Lifting weights. The term itself, "weightlifting," can be misleading. Most people I encounter - at the gym, in exercise videos, and even on social media - are more concerned with how much they lift rather than how they lift, and ignore what is arguably the most important portion of the exercise. What if you were given the proper information that would maximize your gains and reduce your training time? Would you take it? ♦♦♦
Muscles are stronger in the eccentric range of their motion. In layman's terms, you can lower more than you can lift. By accentuating the eccentric, or negative part of each exercise, the muscles remain under tension and the joints in proper position (aka injury-free training). This means do not relax the muscle and drop the weight when you lift it. Instead, lower the weight slower, with control between each rep. Due to the increased time under tension and increased intensity of the exercise, you'll see results faster!
Remember: intensity leads to immensity.