1) Arduous tasks 2) Arduous travels 3) Difficult jobs 4) Difficult journeys 5) Drudges 6) Grueling tasks 7) Hard jobs 8) Hard, boring efforts 9) Laborious tasks 10) Long, tiring jobs 11) Marshy marches 12) Moves through mud 13) Moves through the muck 14) Muddy marches 15) Plods 16) Plods along 17) Plods heavily 1) Treks