I am 45 years old, 5'-10", 145lbs, and ~12%-15% body fat. I have always been light and over the last year have had the desire to gain more muscle mass. I workout consistently now at noon for 45 minutes using a 5-day split. I don't have a problem bringing an appropriate level of intensity to each workout but feel that they're a bit short, I have both work and family that constrains my time, but find a lunch break consistently available.
I've been lifting this way for 2 months now but have only gained about 3-4 lbs. I've noticed some fat loss and some muscle gain, but not as much as I would have hoped for. My primary problem is getting enough calories down each day and struggle to get down even 2000 calories. I've decided to take a weight gainer, but want to make sure that I'm still working out enough.
I thought about adding some supplemental weight training to my program, either early morning or late evening but not sure if that we'll tax my body too much. I'm consistently sore 1-2 days after each workout, which usually means Sundays are the only days that I'm not totally wiped. If I add more training, do you think I'll be able to see better gains, or will I just end up hurting myself?