Step ups:
Hold dumbbells in your hands, step one foot on the box or bench and press through your heel to step up, slowly step back down and repeat - you can do all on one side or switch back and forth between legs.

Weight Recommendations:

Beginner: Bodyweight-7 lbs
Intermediate: 10-25lbs
Advanced: 30-65+ lbs

*Modification: do this without weights!

Lateral lunges:
Start in a wide stance, dumbbells at your shoulders, press straight above your head 2x, then sit into a lateral lunge on both sides, that is one rep!