If you're coaching or training others, teaching and reinforcing proper mechanics is one of the most valuable long-term investments in their strength and health. If you are new to exercise & trying to start off on the right foot, I would 100% recommend hiring someone to help you build this foundation. Even if you have been lifting but feel like you are not progressing, adjustments in your mechanics can make all of the difference. 

Proper movement mechanics ensure that your joints, muscles, and connective tissues are aligned and working efficiently. Poor form can place excessive stress on certain areas that are susceptible to injury, increasing the risk of acute injuries (like strains) or chronic issues (like tendinitis or joint degradation).

Good mechanics will ensure that you are actually aiming to target the desired area. For example, if you are doing are squat & you want to concentrate on the quads but your stance is wide, your chest falls forward, your hips hinge (flexion & extension), & your hip complex & glutes shift back into the posterior chain, you are unfortunately including more posterior chain than you would like. Instead, adjusting your base (narrower), creating more of an upright “stacked position” (shoulders over hips) 180 degrees from shoulders to hips (natural shift slightly forward from shoulders during squat is okay) & knees traveling over toes would ensure that your squat is emphasizing quad activation. Or in a bench press, flaring elbows too wide can reduce chest activation and increase shoulder strain.

Efficient mechanics mean you can lift more, lift longer, and recover faster. Better transfer of force leading to better force production & fiber recruitment. When movements are biomechanically sound, energy is transferred effectively, and you can train with greater intensity. Improve movement in daily life as well, increasing overall movement literacy (staying functional!).

Poor mechanics will 100% lead to setbacks, plateaus, or regression. Even if you think you are doing fine now, it will eventually catch up to you. Creating imbalances & terrible habits that will set you back. Good technique allows for progressive overload and consistent gains without being derailed by injury.

Whether you're an athlete or just want to move better day-to-day, good mechanics in resistance training carry over into improved posture, mobility, and functional strength for real-world tasks or sport-specific actions.

Peer review articles: 

Resistance training among young athletes: safety, efficacy and injury prevention effects

https://pmc.ncbi.nlm.nih.gov/articles/PMC3483033/?utm_

Applied Biomechanics in Sports Performance, Injury Prevention, and Rehabilitation

https://www.mdpi.com/2076-3417/14/24/11623?utm_

Optimizing Resistance Training Technique to Maximize Muscle Hypertrophy: A Narrative Review

https://www.mdpi.com/2411-5142/9/1/9?utm_

Effects of range of motion on muscle development during resistance training interventions: A systematic review

https://pmc.ncbi.nlm.nih.gov/articles/PMC6977096/?utm_

Can Unilateral Strength Training Optimize Change of Direction Mechanics and Mitigate Anterior Cruciate Ligament Injury Risk in Female Soccer Players? A Preliminary Pre–Post Intervention Study

https://www.mdpi.com/2075-4663/13/5/135?utm_