Pedal Power Mulcher
https://www.youtube.com/watch?v=COCRhSTMDh8 They should mass produce this with a larger intake and a finer final cut size. Pieces of wood this big would be considered "wood chips" and would not compost easily if at all... they'd take forever. However, it makes a nice mulch. If you could turn contents into something more resembling sawdust, now we're talking... and you'd probably get an even harder workout too.