When MMA fighters train, many simply train for endurance. While this is a very important training modality in the Octagon, fighters need more than high conditioning levels to achieve greatness in each MMA match.
MMA athletes need power, strength, and a high power-to-weight ratio, along with endurance to go toe to toe with their opponents.
The following techniques are underutilized by most MMA fighters and when incorporated, can make for accelerated results in strength.
These techniques are for offseason gains. I do not recommend them when prepping for a fight simply as a fresh take on your training for accelerated gains in your offseason.
As said before power endurance training seems to be the standard for MMA training, which is important but incorporating maximal effort lifts will create a more powerful physique.
Improving a fighters strength is important for a variety or reasons. Increase in power/velocity of strikes, or a increase in power on the ground just to name a few.
If worried about not making weight simply stay in the 1-3 rep range. Staying in this rep range, along with calories set at or below maintenance, will help build strength while limiting mass gain.