The '5kg in 50 days' Diet!

Dangerous, inefficient, and time-consuming compared to moderate exercise and eating less. Caloric restriction is, by far, more effective than exercise for net deficit. Thunderf00t did a video on this. ▶ this video

Yep, it's basically a distributed gym membership without the gym except for a single expiring, proprietary widget that lives on your property. It's largely ineffective to lose weight by exercising, and so much easier to reduce caloric intake. ▶ this video

Just don't try to lose weight primarily through increasing activity. Activity is great for other reasons, but the human body is just too damn efficient and it would consume too much time. Caloric deficit is the best primary way. The '5kg in 50 days' Diet! (2017) ▶ this video

Caffeine is performance-enhancing, raises metabolism (temporarily), and suppresses hunger. Unfortunately, it's readily-apparent that you can never outrun your fork, so forget about "burning calories" through cardio. The goal of fitness to lose weight ought to be weightlifting to gain as much muscle mass as possible to raise one's BMR. Passive metabolism is about the only way to do it without enrolling in BUD/S. In general, gymrattery and endless treadmill running are wasted effort. ▶ this video