The underarm is one region that may end up looking loose after weight-loss or weight-gain.
From my experience of resistance training, I think these two exercises really help.

inclined bench curls
seated rows,

here is a link to my video on how you can perform them right.

https://www.youtube.com/watch?v=fJEpzLvyMDw
Try them out if you can.

one way people sabotage their workout is to burn out before even starting.
Rome wasnt built in a day. Your body too. Practice, Practice.

Lift and cardio today.. its the weekend..

What body part will you like me to address.. comments pls

The waist. How to make it slimmer without affecting the butt and hips.

sexybaby22:
The waist. How to make it slimmer without affecting the butt and hips.

Legs raises, 3-4 sets of 7- 12 repetitions, 3d firming and results start from day one. if you are feeling strong you can use the leg raise machine, video on on my pages.