If You're New to Strength Training, These Are the 7 Exercises You've Got to Learn

"Planks are great for your core as well as your arms," Adeeb Khalfe, PT, DPT, CSCS, founder and owner of Movement Evolution, told POPSUGAR. No matter the variation, make sure you keep your core engaged the entire time, he said. Khalfe likes the side plank in particular because it help with lower-back pain.

• Balance on your right hand and the outside edge of your right foot, with your body in one straight line. To modify, stagger your feet and bring your top leg forward.
• Hold for 30 seconds on each side.