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Doing leg exercises(like leg presses etc) is fine. 100m sprinters like Asafa Powell, Usain Bolt and Tyson Gay have well developed shoulders, lats and arms too.
Do they workout for their upper body also? how does their training regimen look like?
Sprinters do things like most other atheletes, or they should. Power cleans and squats, chin ups, back work. Typical stuff as far as weights go. Dont overtrain the calves or single joint movements like so many do to go on and pull a ham or achilles. The arm swing and momentum thereof is a great determinant of stride frequency as my coach used to say that the legs are waiting on the arms. Work on the hip flexors and keep them stretched along with everything else. Sprinters get lean cause they are always working and running so they usually don't hold on to alot of fat and water. You gotta eat to sprint too. Unless youre a natural sprinter. Sprinting workouts vary as much as flowers under the sun and its been too long for me to comment on whats hot out there now.