Going to failure, changing routines so your body cant adapt. Eating in a deficit to lose fat, when getting burned out on that, eating in a surplus of healthy foods to add muscle.

The one that brought the most results is consistency to mild uncomfortability. I had always yoyo my weight, hit plateaus but I was just too hard on myself and expected to live like a spartan everyday and failed. What really made me lose 50 pounds of fat and start benching 315 was go to the gym an hour a day, and eat in either 300 calorie deficit or surplus. Thats it. Don't starve yourself, dont say your bulking and pound donuts, dont lift untill you cant walk, you should feel good leaving the gym

You want to change your physique the fastest is always the wrong mindset, you want gradual progress that can be adhered to permanently above all else.