Lifting activities must be organized in such a manner that the muscle groups worked are those used in wrestling. If not, the lifting program will be ineffective.
The purpose of conditioning skills is to supplement (not replace) wrestling. All conditioning drills should be developed with the objective of having maximum carryover to the sport itself. This is called specificity of exercise. Your goal is to make each conditioning drill as specific to wrestling as possible.
Fortunately, this is not difficult because wrestling requires so many different levels of fitness: strength, quickness, agility, endurance, flexibility, balance and mental toughness.
Wrestling is considered by many to be the most strenuous and physically demanding sport of all. So just about any conditioning drill will have benefits for the wrestlers.