out of condition
Definitions
Not in a good state of physical health or fitness.
Lacking the necessary training or practice to perform at an optimal level.
Examples
After months of sitting at a desk, I felt completely out of condition during my first run.
The athlete realized he was out of condition when he struggled to keep up with the rest of the team.
Since I have been out of condition for so long, I need to start my exercise routine slowly.
Synonyms
unfit out of shape flabby sedentary soft unconditioned out of practice