You can definately do more with your arms. Low weight with high reps will keep you flexible and avoid injury but you still need to challange your muscle. I would reccomend 3 or 4 sets of 12-15 reps. When you can do 4x15 comfortably add some weight and start again (4x10, 4x12, 4x15). Work your biceps and triceps the same day (I do a combo; biceps, then triceps then 30 sec rest - repeat). Rest is important - at light weights you can go almost every day but you do need a day of rest every few days. Listen to your body and slowly add chest, lats and back. I am still avoiding core (sleeved 9/26) but am in gym 5x week.

Check with your Dr about core work - very individualized, based on how you are healing. As for other exercises; most gyms give new members 1 or 2 free basic sessions with a trainer. Take one. They will teach you the basic circuit machines and help you get started safely. It's important to know how to use the machines so you can avoid injury.

I have been working with free weights for my arms (to fight the flab) and walking since the day I was released from the hospital. I am 7 weeks out today and have been doing leg lifts, the stairs at work, the recumbant bike and Wii fit for at least 2 weeks. I exercise everyday but I do different things every day so I don't get bored or just work the same parts of my body all the time. I am over a month out and feel pretty great. I will say though that I started to do sit ups and crunches and I was told by my Nurse Practitioner to hold off on core excercises for a couple months. They did clear me to swim at my 1 month visit.

I am not medical professional and am not saying you should do any of these but you may want to get clarification from someone that is a medical professional as to when you can start getting more active.

Best wishes!

Got the same advice for core - 8 weeks. Sleeved 9/26 and just started doing exercises that also work core (Squats and deadlifts).