Plural number: training camp.

Similar phrases:

Get trained. Good exercise, good physical condition and good competitive condition.

In training. Training is in progress.

Training AIDS. Training AIDS, training AIDS.

Training captain. Training captain, training captain

Training institutions. Training courses, training institutions.

Altitude training. Altitude training.

Action training. Action training.

Example of actual scene:

1.？ As a freshman, it is equivalent to boot camp academically.

Freshman there is equivalent to entering boot camp.

2.？ The recruits are trained in the boot camp.

The recruits are trained in the boot camp.

3.？ George Steinbrenner was at Yankee Camp during spring training in March.

George Steinbrenner was at Yankee training camp in March.