Walking is very good for you.
Running is also good for you.
Believe it or not, working is also good for you.
OK, so, if you want to discuss "how much" of all this is good for you, there are several ways to do that. You can add the following adjectives: "much", or "a lot of", or "lots of", or "frequent", for example.
Generally, in speaking, we would not say here: "much walking", we would say: "A lot of walking may tire you".
However, in writing, and more literarily, you will see: "Much merry-making took place in the little town that holiday season", or "**Much walking is needed to lose weight". "There was much drinking that night." In all those, in speech, we are much more likely (haha) to say: "a lot of".
Whether you call this use of the gerund a noun or verb, it does not matter very much. In other words, the "-ing" form of the verb can function like a noun or function like a verb.
- He is walking to school. [is a verb]
- Walking is good for you. [functions like a noun AKA by some as a verb paradigm.]
What like a noun? Because it can be qualified: much walking, little walking, a lot of walking, frequent walking, regular walking, etc. And, therefore, in cases like this the qualifiers function like or are adjectives.
So, are you saying it or writing it?
Also, be aware there are nouns structured like this:
The Hunting of the Snark [Lewis Carroll]
Often, those don't have adjectives, but they could:
Extensive hunting of snarks led to their extinction.