No one needs a single piece of weight to exercise.
And I go a step further, saying that no one needs any piece of equipment at all.
The whole thing in having machines, treadmills and so on is a new invention.
A commercial invention, to be more specific.
What you need in your exercise routine are number one determination, secondly knowledge and thirdly technique.
The main thing is to move your body.
Above all, it is essential to have the support of a fitness professional.
The answer is NO!