Think you’ve seen and done it all when it comes tofitness?

No matter how long you’ve been working out, there’s alwaysroom to improve and challenge yourself.

The exercises below were selected by fitness trainers based on how challenging they are to learn and master.

Keep reading below to learn how to master three of the hardest workout moves, according to trainers.

It is a full-body movement, involves level changes,fast twitch muscle fibersand speed.

If you’ve never done box jumps before, you should start with low height boxes to avoid injury.

Slowly piece them together to make it the full movement," Taylor says.

“you might also use a band to assist you.”

“The band is attached to the bar overhead to offset some of your weight.

You will place your knee or foot in the bottom of the band and perform your repetitions.

Bands may be purchased in varying strengths to provide the assistance you need.”

“The obliques are an important muscle group that often go untrained,” he says.

Once you feel comfortable with the full side plank, add the clam shell move.