The second exercise that i would suggest for strong arms is Shadow Boxing.

Stand erect with both the legs placed apart.
Position your arms in the boxing pose as shown.
Stretch your fist imagining that you are thumping somebody. Now as you take your hand back visualizing that you are saving yourself from the opponent blow curving your knees.
Now for the next blow instantly move your fist imagining punching somebody under the jowl.
Repeat the punches till you get exhausted.
Wanna make your arms strong and sturdy? Perform the below mentioned exercise thrice a week and your arms will become athletic.

Stand in a crouch position as shown in the figure. Knees should be bent so as the chest and knee are in the same line.
Grasp a light dumbbell with your palm in the backward direction. Ensure your hands to remain straight.
Winding your hands lift your fist towards the chest.
Shove the dumbbells stretching your arms and knuckles up.
Curve your hands towards the axilla (armpit) and stretch them back straight.Repeat the exercise at least 10 times.