Bodybuilding sentence
Dear teachers
Could you please examine the following sentences and tell me which of these are grammatical and idiomatic:
To fend off bullies, I will have to get into bodybuilding.
To fend off bullies, I will have to start bodybuilding.
To fend off bullies, I will have to become a bodybuilder.
To fend off bullies, I will have to get into weight training.
To fend off bullies, I will have to start weight training.
To fend off bullies, I will be needing to start weight training.
To fend off bullies, I will need to start weight training.