How to be strong
How can I fear no one and be strong?

Start asking yourself why you fear others.

You can exercise - upper body, core, lower body, pilates, stretch. Don’t just workout for results like a specific body, depending on gender and your lifestyle they can come fast or slow. But progress is still there. Working out has many benefits and makes you feel good.

Drink water. Don’t overwork yourself.
Eating healthy is good, but if you have nothing healthy to eat, eat in smaller portions or interment fasting.

Watch yt creators that motivates you to develop a healthier/strong/better/productive lifestyle. I watch Nicole Laeno, Linda Sun, and Hannah Adkins.

Inaccuracy is a disadvantage

The person who utilize the progression principle will keep adding the difficulty of the exercise that he's doing, while the person who does not, will only stay stagnant.  the person that utilize progression principle, will get a stronger endurance because now his body is conditioned to do harsher routines.{the answer was already on verified)