You can do swimming drills any time during your swimming workout. If you do a drill with a non-standard swimming style (for example, using only your legs), you can adjust the drill distance by adding pool lengths manually after the drill, if necessary.
Do not add the drill distance until you have finished your drill.
To do a drill:
To end the drill, go back to Swimming in the options menu and select End drill.
You can pause the drill by pressing.