While Instagram’s focal point for female training may almost exclusively concentrate on our lower bodies, a strong top half is still important. “If you’ve got a weaker upper body, generally speaking, the lower back region tends to overcompensate,” says personal trainer Ellie Crawley.

“Also posture-related issues that can be caused by weak or tight chest or back muscles can impact your running and even your everyday walking. That’s because of the movement patterns from joints in the upper body to your hips.”

Given that your arms dangle away from your body, is their impact on your hips and posture really that pronounced? “Everything in your body is related,” Crawley remind us. ”The arms help with the flexion of your elbows, the rotation of your forearms, the stability of your shoulders and your general range of movement.” That means no muscle’s strengths or weaknesses are in isolation – weak arms can also tarnish the function of your big, impactful muscles.

“Does it matter if my arms are weak?”: the truth about strengthening your upper body