Some good exercises for toning flabby arms are uneven push-ups, Pilates boxing, triceps swings and kickback with a twist. All of these exercises can be done at home, whenever time allows, with minimal equipment.
Uneven push-ups are a slight variation on the classic exercise using a soccer ball or something of similar height to offset one arm. Pilates boxing is a good fat-burning exercise that also tones the arms and shoulders with no equipment necessary. Triceps swings help tone the triceps using light weights for resistance. Kickback with a twist also uses light weights and focuses strictly on development of the triceps muscles.