Is it good to take ON serious mass without working out.?

I bought ON serious mass gainer(6 lbs) because i'm very skinny(154.6lbs) for 6'0 guy. The problem now is that i have little to no time for lifting weights cos of school. Would it be fine to take mass gainer while only doing simple exercise? Such as push ups, pull ups, sit ups, planking, and bicep, tricep... show more I bought ON serious mass gainer(6 lbs) because i'm very skinny(154.6lbs) for 6'0 guy. The problem now is that i have little to no time for lifting weights cos of school.

Would it be fine to take mass gainer while only doing simple exercise? Such as push ups, pull ups, sit ups, planking, and bicep, tricep dumbbell curls?
Update: Are there any side effects when taking this product? I plan on only taking once per day, i fear on getting diabetes or overdose.
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