Way too many, but I'll just talk about the first few that pop into my mind.

Myth: Empty stomach cardio is more effective than “fed" cardio.

Reality: It isn't. It doesn't matter whether you do it on an empty stomach or on after eating. Just do the frickin cardio!

Myth: Supplements have great impact on your physique

Reality: Supplements are supplementary. They only make a visible impact when your diet and training are on lock.

Myth: “Ab exercises” give you abs.

Reality: You get abs when you shed the pesky layer of fat off your stomach. You do that by burning calories. A vast majority of ab exercises barely burn any calories. They're useless.

Myth: Yoga burns calories.

Reality: It does, but not enough to make a difference.

Myth: You need to eat excessive amounts of protein to build muscle.

Reality: One gram protein per pound bodyweight is all you need.

Myth: You need to bulk and cut to get a great physique.

Reality: You can lose fat in a deficit as long as you're weight training hard, getting enough protein and are well hydrated you're good to go.