The word “strengthening” refers to the act of making something stronger or more powerful. A synonym for “strengthening” could be “fortifying”. “Fortifying” implies making something more secure or robust by adding strength. For example, “The new exercise routine is fortifying her body and improving her overall health.”
Another synonym is “enhancing”. “Enhancing” suggests improving or adding to the quality or value of something. For instance, “Reading books on a regular basis is enhancing his knowledge and vocabulary.”
“reinforcing” is also a good synonym. It means adding support or strength to something to make it more durable or resistant. For example, “The additional training is reinforcing the team’s skills and confidence.”
All of these synonyms for “strengthening” convey the idea of making something better, more powerful, or more resilient.