You can really improve your physique with/by working out. Both need 'by', but like this: You can make a lot of food taste better by adding ketchup. You can really improve your physique by working out.
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levis1A lot of food you can make taste better with/by adding ketchup.You can really improve your physique with/by working out.
Both need 'by', but like this:
You can make a lot of food taste better by adding ketchup.
You can really improve your physique by working out.
CJ