There are a number of arguments which aim to prove the impossibility of free will.
The Standard Argument (incorporating the Determinism Objection and the Randomness Objection) is well known and powerful, although subject to a variety of criticisms.
I seek here to provide an argument immediately testable via personal investigation.
Is the following argument sound?
Note: here, an 'act' is defined as 'a thing done', as per Oxford Languages definition #2.
In order for an act to be voluntary, a person must decide to perform it.
A decision is an act. Therefore, in order for a decision to be voluntary, a person must decide to decide it.
This leads to an infinite regress of prior decisions, in which any voluntary decision requires an infinite chain of prior decisions.
Insofar as free will requires the ability to make voluntary decisions, free will is impossible.