Dynamic exercises are generally better than static stretching when it comes to warming up. Not only do they loosen things up without harming performance, but the right moves can even activate muscles and enhance performance. Here's one to try out.
Around the World
This is very useful for the external and internal rotators of the hip, which tend to have some residual kinks no matter how well you warm-up. This will also loosen up the knees by acquainting them with the extended ranges that may or may not be encountered in the upcoming lifting session.
Bonus: They'll also give the lats and trunk a good stretch.
related posts
Tip: The Tempo Squat
For 40-60 seconds, squat constant-tension style: no pauses or lockouts at the top. Take 2-3 seconds to go down and 2-3 seconds to come back up.
Tip: The Front Raise Complex for Big Delts
For complete shoulder development, don't forget the anterior delts. This complex with light them up.
Tip: The New Loaded Carry. Sort Of.
Loaded carries like farmer's walks can be tough to do when the gym is packed. Try this version instead.
Tip: Front Squat to Box
Nail your quads with this exercise. Be sure to pause 1-2 seconds on the box.