A steep rise in gym-related ACC claims for injuries could be down to strength training's rising popularity. 

Accident Compensation Corporation data shows it accepted about 50,000 gym-injury claims last year - worth about $50 million dollars.

It notes training and gym activities now account for the most claims.

Body Torque Personal Training founder, Alex Flint, says training with weights can result in shoulder and lower-back injuries.

"Sometimes with that increase and uptake in a new type of exercise comes over-enthusiasm."

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