I've been bodybuilding on and off for 23 years and I can assure you that resistance exercise + Low intensity cardio + the ideal amount of protein intake (as part of a balanced Macro combination) will definitely help you keep the fat off in the long-run. Notice here that I used the word 'fat' and not 'weight' (weight includes fat & muscle). If you manage to gain a few pounds on the scale while making sure your calorie and macros consumption are in check, then it is most probably an increase in muscle mass, not fat mass. How can you know for sure? Make sure you measure your body composition (Fat %, Fat weight, Lean Muscle weight etc) before you start carrying weights. Then measure again at the end of the month. Then compare. You'll be surprised sometimes to see that the weight scale hardly moves as your muscle mass replaces fat mass. Aesthetically though, you'll look much better when muscle gets packed on (as long as you dont gain fat 🙏).
I advise to google ' Body Recomposition' if you want to accomplish any of the following goals/scenarios:
Building muscle while simultaneously losing fat
Building muscle while maintaining body fat mass
Losing fat while maintaining muscle mass
And the best literature I've read on Body Recomposition is by Jeff Nippard. He'll set you straight and make you an expert in no time.
Oh yeah and carrying weights 3 times a day , on alternate days for 8 weeks is an excellent starting program.
Good luck Jaye