When you want to isolate specific muscle groups in the arms, using dumbbells is truly effective — get ready to feel the burn! Grab some weights and work your arms. shoulders. and upper back!

When you want to isolate specific muscle groups in the arms, using dumbbells is truly effective — get ready to feel the burn! Grab some weights and work your arms. shoulders. and upper back!

Original article and pictures take https://fitsugar.com site