he keep fit. vs he keeps fit

Some examples from the web:

• Good. So you can do some sport and keep fit.
• Maybe a bit of keep fit.
• He loved women and did press-ups to keep fit.
• On the space station you rode a bike to keep fit.
• Fights are good, They're good to keep fit.
• I told her it keeps me fit.
• He was trying to keep fit for some girlfriend.
• It encourages elderly people to keep themselves physically fit.
• I shouldn't, but it keeps me fit.
• In our single market, competition - including competition between regions - plays a decisive role in terms of the further development of European enterprise and of the way in which it can keep itself fit.
• All the more reason to keep yourself fit and healthy.
• To keep fit, people in Britain go to gymnasia.
• You know us Alphas got to keep fit to lead the pack.
• We can check the keep-fit exercises for housewives if you want.
• Keep her figure trim, keep fit?
• Pál Schmitt has his own advice on how to tackle obesity and keep fit: "as a former Olympian, I'd suggest children exercise on a daily basis, taking part either in or out-of-school sport activities, and adults at least 3 times a week".
• Of course, I keep fit every day
• I play soccer and table tennis and other things to keep fit
• People in Britain like to keep fit by taking long walks and regular masturbation, whereas in America, people like to attend gyms, like this one.
• When we talk about drugs we have to make a clear distinction, as we do when it comes to any other discussion on sport, between keep-fit exercise and major sporting events.

Some examples from the web:

• He was trying to keep fit for some girlfriend.
• Good. So you can do some sport and keep fit.
• Maybe a bit of keep fit.
• To keep fit, people in Britain go to gymnasia.
• He loved women and did press-ups to keep fit.
• You know us Alphas got to keep fit to lead the pack.
• On the space station you rode a bike to keep fit.
• Fights are good, They're good to keep fit.
• We can check the keep-fit exercises for housewives if you want.
• Keep her figure trim, keep fit?
• Pál Schmitt has his own advice on how to tackle obesity and keep fit: "as a former Olympian, I'd suggest children exercise on a daily basis, taking part either in or out-of-school sport activities, and adults at least 3 times a week".
• Of course, I keep fit every day
• I play soccer and table tennis and other things to keep fit
• People in Britain like to keep fit by taking long walks and regular masturbation, whereas in America, people like to attend gyms, like this one.
• When we talk about drugs we have to make a clear distinction, as we do when it comes to any other discussion on sport, between keep-fit exercise and major sporting events.
• Calls on the Member States and employers to stimulate their employees to participate in keep-fit and physical activities, especially women employed to do monotonous tasks which can lead to chronic diseases;
• I told her it keeps me fit.
• All the more reason to keep yourself fit and healthy.
• Eating healthy, 'cause I'm marrying a lady That keeps it fit - you know, nice and tight.
• It encourages elderly people to keep themselves physically fit.