Need to work on your triceps? Tighten your backside?

Need to work on your triceps? Tighten your backside? Here's an exercise that does both lat.ms/1d4tqYp
Grab one 5- or 10-pound dumbbell. (Beginners should go for the lower weight.) Start with a set of overhead triceps extensions: Stand tall, abs tight, both hands holding the single dumbbell straight above your head. Keep your elbows as close to your ears as you comfortably can as you slowly lower the weight behind the head. When you can't go any lower, reverse the movement while "really squeezing throughout the triceps." Don't let momentum do the work for you. This is one exercise where "mind-muscle connection is everything," Lyons said. (Note that you might need to take time to find the most comfortable grip.)