How do I break up a concrete block?

For my eagle project I am redoing a trail near my house. To do this i need to put in new benches. There are five benches there and three of them are made of concrete. The benches look like a large concrete block on top of three pillars of cinder blocks. There is a crack down the center of the block on top. The cinder blocks are also filled with cement to hold them in place. Is there a way that I can break them up to be able to haul them out in a wheel barrow or something like that. Please also keep in mind that I do not have access to electricity because the trail is through the woods. Please help. Thank you.