3. Doing planks for too long
If your core muscles are strong, you can spend a lot of time standing in plank before you even feel any strain in your abs. Instead of increasing the time you spend in plank, try to remove one of the contact points, for example, one of the legs, from the floor.
4. Expecting a flat stomach by only doing ab training
Just training your abs won’t help you lose belly fat. You can develop a 6-pack by doing crunches, but you still need to lose the surrounding fat. And this fat is not gonna go anywhere if you just do the targeted abs training. Cardio training will help you burn extra calories and lose weight faster.