In addition to the dumbbell hammer curl you could also do neutral grip barbell curls if you re lucky enough to have access to one of those old school bars with the vertical handles.
Neutral grip barbell curl.
Likewise the rope hammer curl is a great option.
Hold a set of dumbbells with a neutral grip so your palms are facing each other.
A study published in the american journal of occupational therapy tested participants grip strength using a neutral pronated or supinated grip.
Curl the dumbbells while keeping your palms facing each other.
Raise the barbell by bending at the elbows keeping your thumbs facing up 3.
A neutral forearm position provided a stronger grip than a pronated or palm down position.
Instead of your palms facing toward you or away from you they re turned in so they re facing one another.
Most barbell triceps exercises are performed with a pronated or overhand grip.