Focusing on arm workouts

I am going to participate in a group fitness class.

When I workout on my own, I only focus on the same muscle groups.

I particularly like to concentrate on my legs and butt. I often do cardio or strength training that is all about the lower half of my body. If I do any arm work, it strictly involves the tricep area. I recently realized that I am basically toned all over, but I have weak biceps. I am always reluctant to lift weights. I bought a set of free weights but they just collect dust in the corner. I get bored with lifting and my form is bad. I frequently manage to hurt my neck when I lift weights. There is a group fitness class offered at my gym. It is centered around strength training. They don’t just lift weights to tone their arms. The fitness instructor incorporates medicine balls, weighted poles, kettlebells and all sorts of interesting equipment. I know she asks the class to maintain plank position, go through push ups and shadow boxing with weighted gloves on and work with battle ropes. There are all sorts of ways to build arm muscles. I want to take the class but I am worried I won’t be able to get through it. I worry that my inferior biceps will fail me. That is why I am starting out with a single day a week. I am not looking to build arms the size of Arnold’s. I just want to improve the strength and tone of my arms. My goal is to include an arm based workout into my weekly routine at least 2 days per week. This seems like a doable achievement.
Yoga classes