How to workout my pecs short machinery?

Any one no og some good pec exercises i can do without machinery or equpitment? i no of the obv. push up but i be thinking more of like a seated work out thx
Answers:
does a medicen ball count as machinery? becuase you can do really honourable accross body workouts with them :)
SQUEEZE YOUR HANDS TOGETHER AS HARD AS YOU CAN FOR A CERTAIN AMOUNT OF TIME AND DO IT REPEATEDLY FOR LIKE 3-5 TIMES. OR YOU CAN ALWAY DO DUMBELL BUTTERFLIES?
Impossible without machinery to do it properly mate, acquire some dumbells and do either dumbell flys or incline chest presses (for upper pec workouts - it's WAY harder than lower pec)

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