אִם־אַ֭תָּ֗ה הֲכִינ֣וֹתָ לִבֶּ֑ךָ וּפָרַשְׂתָּ֖ אֵלָ֣יו כַּפֶּֽךָ׃
If thou set thy heart aright, and stretch out thy hands toward Him—
Malbim on Job
Regardless of the philosophical and theological problems, subjectively, man knows that he has free-will. He feels no inherent restrictions on his choices. Whatever the mind decides, the body effects.