resistance,
The plank is another common exercise. The plank works many core muscles, including the abdominals. You can also do it on your back with the heels pressed against the toes.
Another great option for static hold bicep curls is a double weight stack or dumbbells. You can also use a weight machine for double stacked biceps.
Static holds can be a great way for you to increase your strength and challenge yourself mentally. While you may want to get out of static holds quickly, it is important to keep your eyes on the goal. These require you to be focused on one task for long periods of time and give you a goal.