Flex

Flex, or Flexing, is a tactic where a player Hypers up his or her monster and then returns to Alpha form later that same turn. It is primarily intended to conserve health in the Hyper form, though it can also be used to gain the benefits of granted abilities from and Alpha form during unit turns (such as with Gorghadratron's Drain Life or Cyber Khan's High Impact), or to benefit from a more defensive Alpha Form (such Tharsis-5's Armored ability).

Monsters that are generally considered to be good "flex monsters" tend to be ones with a low Hyper Cost and either defensively strong Alpha forms, Alpha forms with a large amount of health, or Alpha forms that provide boosts to units.

Flexing does not refer any transition between Alpha and Hyper forms. Flexing specifically means hypering down the same turn you hypered up or, more rarely, hypering up with the intention to flex down the same turn.