When a simple magnifying glass is used properly, the image will be formed

Well, the key here is:  What do you mean by "properly" ?
I'll assume that you mean using a simple magnifying glass
to magnify things, not to burn ants or ignite newspaper.

When a magnifying glass is used to magnify ... for example,
to inspect the markings on a dime, or to read the fine print
in an insurance policy ... no image is formed.  That is, no real
image.  It's called a 'virtual image'.  It's erect, and it's on the same
side of the glass as the object being examined.

All are great precautions but you can still lift lighter and different muscles in between hard workdays. this keeps other muscles not usually used in shape.