You may be bundled up now, but toned arms are always in season! Give yourself a head start on tank top season with a workout aimed at targeting your arms and core. Mixing a series of specific arm exercises like bicep curls with a variety of planks, this series will work both your arms and core simultaneously. Get the most from this workout by customizing it to your fitness level, using the dumbbell weight of your choice, and choosing your rest time in between sets. Remember — those racerbacks will be here before you know it!