i've had people tell me that i had the tiniest hands they've ever seen on a guy my age but it never affected my passing,,,,,,and on a side note, one of the people who said that had previously known me for over a year and never noticed my hands before.
(p.s. if you really feel like you need "manlier hands" though, that's easy to achieve -- do all the nasty household chores like the dishes and floors...every day, cook your meals from scratch...within a year you'll have hands like my mom...who has the "manliest" hands you've ever seen

)
edit: i agree, fixing old cars would be the fastest way