vanilla ice and red lion. you'll love them.
Not physically strong, so maybe? http://www.mangago.me/read-manga/monkey_high/
Shounen: http://www.mangago.me/read-manga/ookami_san_to_shichinin_no_nakamatachi/
http://www.mangago.me/read-manga/horimiya/
http://www.mangago.me/read-manga/obaka_chan_koigatariki/ girl is stronger than a boy
This is really funny http://www.mangago.me/read-manga/sumomomo_momomo/
Is there a shoujo manga where the boy is weak and the girl strong?ლ(´ڡ`ლ) (=・ω・=)