为了锻炼自己英文

toughen myself up

challenge myselfimprove myself意思差不多就可以，我觉得

我要努力锻炼自己，拥有保护你的能力。I want to work hard and have the ability to protect you.我要努力锻炼自己，拥有保护你的能力。I want to work hard and have the ability to protect you.

I came here to train myself.I'm training myself and so I came here.

I will try to exercise myself to have the ability to protect you满意请采纳，谢谢