noun, noun which may take the genitive case particle 'no'
lack of exercise; insufficient physical activity
Commonly used to describe a sedentary lifestyle or not getting enough physical activity. Often appears in health advice and self-assessment.
Lately I've gained weight from lack of exercise.
To fix my lack of exercise, I decided to walk every day.
Working from home more often, I've become out of shape from lack of exercise.
I go running on weekends to make up for my lack of exercise.
Lately I've been feeling like I don't get enough exercise.