Physical labor: it sucks, for the most part. Mind numbing, body damaging, most anyone (of physical ability) can do it if briefly trained. Hard work on the body, no work on the mind. Sales: if you're good at it, it's awesome. Commission pay is a blessing and curse. How hard you work is directly correlated to how much you make, so it behooves you to work hard. Doctor: Probably the hardest working of the five. Long, off-beat hours, grueling school to get there, malpractice insurance, super hard to maintain a family life unless you are in a small office. Oh and your job could be real live and death situations on a daily basis. Investment Banker: to the person who said using Excel means you're working dumb (or whatever) I challenge you to make valuation models that affect multi-million dollar deals for 90 hours a week and then tell me if there's a better way to make said models than in Excel. Why make proprietary software when Microsoft has made a perfectly good base for you? CEO: If you're a good one, this is a non-stop job. Perks, for sure, but loads of stress and decisions that affect your company and its shareholders.