Players walk into the lineout and lift as soon as they are in line.
If there are no defending jumpers, the best option is to go straight up in the middle.
This requires practice to ensure timing and communication between, the hooker, jumper and lifters is right.
A good foundation exercise for technical development of practicing lifting with a tackle bag. You could use a contact pad or a tyre if you do not have a tackle bag. Key factors : Strong body position - Fast feet - Straigh back - Lock out the arms - Use momentum of both players
Progress lifting practises with more movement as is required in matches. The coach can alter things to make the exercise easier or more demanding. Key factors : Communication - Fast feet - Straight back - Squat / bend the knee's - Lock out arms