Struggling to have consistency in my workouts
Hi. I (19M, 5' 11'', 66kg/145 pounds) have avery sedentary lifestyle. I'm gonna have to add a few notes for context.
Up until 2023, i was a bit overweight, having reached 86kg/190 pounds, with still no exercise. I then tried to start cardio and dieting, which led me to, in 6 months, lose 30kg/66 pounds, then being underweight. However, i was never satisfied with my results, because all i did was lose weight, i still had basically no muscle mass and kept a very annoying belly. I kinda gave up exercise for a few years.
Recently, i decided to change that finally and start taking exercise more seriously, but i'm really struggling to keep consistently training:
I've tried to start muscle exercise, but since i'm so INCREDIBLY sedentary, i cannot keep any sort of consistency. I started with a 15 min leg workout, and i could barely bend down for 3 days. The day after i did upper body for 15 minutes, and my arms are still locked into place due to soreness. I even tried 10 min with abs and for 2 days i had trouble getting up. It reached a point where everything was so sore i couldn't exercise because i had no strength in any muscle. Not sure what can be done here, but is there something that could be done here? It's incredibly frustrating to try to exercise and just be in such pain that i have to sit all day. Could it be that i started off too hard, or do i have to accept that my body will take time to even achieve some level of consistency?
P.S.: i think it might be important to mention, i tried to change my diet too (eating much less food, cutting out processed stuff, and getting more protein in), leading me to lose 3 kg in a week. But i am not sure this will help me gain muscle since my weight is already on the lower end, and it might also not help with my struggle to have consistency