I don't seem to have enough time to fit exercise into my life. i need exercise to stay active & not lose weight as i'm borderline underweight. any recommendations? am i late (30) to better my health?

Yes: FIND the time to make exercise part of your life. You won't have time unless you make time.

Depression, Anxiety: I commend you for being concerned about your borderline underweight You need to have all 5 areas of health-Physical, Intellectual, Emotional, Social and Spiritual Health; and to have Balance. You have put yourself in state of “Poverty of Time” and not in control Use Breathing relaxation, Tai, Chi, Yoga, and Meditation See a Therapist for coping with stress, priorities, needs and life style

Make time: you will feel better and be more productive.

Try: Exercise once you wake-up or before dinner even for 15 minutes . No need for Gym