There's no doubt standing on the trolling motor all day can be exhausting....add in throwing a jerkbait or a deep diving crankbait and it becomes more like work....physical fitness helps but I don't think it's that important to fishing.....some of the best fisherman I know are overweight or older and sit up front in a seat all day....I recently cut way back on dipping and immediatly put on 25lbs.....I can tell it slows me down some just hope it doesn't affect my stamina next fishing season