Compound exercises which they call the big 5. Deadlifts, squats, bench press, pull ups and military press. Being honest I've not done weights for 3 years.
For 2 and half years I've just been doing the original insanity and insanity max 30, switching between the 2. All bodyweight exercises and fucking brutal. Stick at it and your fitness will reach a great level.
Ever done the bent over row? Looks easy but is difficult when you up the weight.
Insanity has made my butt cheeks firm as anything and shaped very well.