Well, unless you're related and have his genes, any resemblance will be difficult, but you could certainly get as ripped as him, or your own version at least, if you follow a similar training program, with the same amount (or more) of time invested, rigorously (or should that be rigorousLEE).
Bruce Lee wasn't born that way, and he didn't have any kind of special super power, aside from a laser focus and will power. He was relatively sickly as a young child, but that changed when he started to become more active, but for all intends and purpose, he was just like many of his peers.
Simply said, if you want to be like Bruce Lee, you've got to put in Bruce Lee time. Which is a lot!! Many of us will have to make do with lesser goals as you may have a full time job (Bruce didn't, for that matter his wife did a lot of jobs on the side in the earlier stages so that he could train and work on his dreams), a family to look after or others. We also have many more distractions, there's all sorts of media that can keep us of our focus, so discipline is key.
So first off, develop a realistic training plan, setting aside a realistic amount of time that you could stick to. Set alarms and reminders on your phone etc. to remind you it's time, tell your friends you're going to train , so they will enquire how things are going from time to time, keeping you on your toes, and keep a log of your progress. This will be a good help in seeing where you're going.
I'm going to asume that you are an absolute beginner for a moment, that needs some direction in your training. So lets have a look at some fundamentals. If you want to be 'like Bruce', or just a good allround athlete, you will have to invest time in training strength, cardio, flexibility/mobility and of course in our case, martial arts. Your training will have to be tailored to your goals. If you want to gain big muscles, your weight training needs to be tailored to acchieve that, but it will not be good for martial arts as having a big (body builder type) physique will limit some of your mobility, and speed.
But lets forget about specifics for a moment, you first need to start with the foundations, so here are a few links to websites, that have a good program for 'foundational strength', cardio, and flexibility.
Note these are not clickable links. Instead copy the yellow text into a new browser tab/window to take you to that page (I did this for security reasons).
Work on those first for 8-12 weeks, log your progress and after that period, you can start to tailor your training to more specific goals.
STRENGTH: (you'll need access to a gym, or have some equipment at home)
For males: https://www.nuffieldhealth.com/article/gym-workouts-for-beginners#beginner-gym-workout-for-males
For females: https://www.nuffieldhealth.com/article/gym-workouts-for-beginners#beginner-gym-workout-for-females
A lot of these type of exersizes can also be done with resistance bands etc at home, and can be quite effective, so if you want to test the waters, that's a cheap way to begin. There are plenty of tutorials on Youtube you can follow for a full body workout.
If you have no equipment, or simply just want to start with bodyweight, then a good calisthenics program is your best bet. I would highly recommend Al Kavadlo's programs. He's a really nice guy (despite appearances) and has a great little app available on both iPhone and Google Play stores.
Look for 'We're Working Out' by Al Kavadlo. Here's the iPhone link: https://apps.apple.com/us/app/were-working-out-al-kavadlo/id1067817073
Here the Google Play: https://play.google.com/store/apps/details?id=no.agens.workingout
CARDIO:
Beginner cardio can be done indoors or outdoors. Indoors I'd recommend things like squats, burpees, jumping jacks, jumping ropes (perhaps best in your garden for fear of your furniture...) or if you have access to a gym, use an eliptical. This machine will give you a full body workout that will have you work up a sweat in no time. A treadmill or stationary bike work too of course! Bruce Lee had a stationary bicycle, and he regularly went for a jog (but not at a leisurely pace, he'd really be running! Interval runs).
Outdoors as a beginner, I'd warmly recommend a couch to 5K program. As a martial artist, it is not neccesary to be able to run a marathon, our endurance needs to be focussed on short explosive actions, so a 5K is more than long enough. Once you can comfortably jog for 5K (taking around 30 minutes to acchieve 5km), it's time to introduce intervals, so that every few minutes, there is a sprint for 10-30 seconds involved. You can gradually build this up further to include more / longer sprints and shorter 'rest' period, using the same distance/route. This will challenge your cardiovascular system, and you keep growing/improving.
Couch to 5K: https://www.nhs.uk/live-well/exercise/get-running-with-couch-to-5k/
FLEXIBILITY: For martial artists, this is a nice little warmup beginner routine: https://www.youtube.com/watch?v=UiO3WBOxUsc
Here's another: https://www.youtube.com/watch?v=1R43EfuK59E
And one more: https://youtu.be/vMMbHjoCgoE?si=I93beQZQCPr2Aut4
MOBILITY:
Mobility is different from flexibility, although they go hand in hand, but mobility focusses more about range of motion and moving your joints in all directions using muscular strength, wheras flexibility focusses more on the muscle tissues and tedons.
Here's a nice beginner routine: https://www.youtube.com/watch?v=WF88MJGikNU
Another no nonsense mobility program is the one developed by Tom Morrison. I can personally recommend his 'Simplistic Mobility Program'. I've been using that myself and has sorted out several issues I didn't even knew I had, plus one I did, occasional lower back aches..
His website is here: https://tommorrison.uk/
See how all these topics compliment eachother? Funny that, it's how humans move!
If after 8-12 weeks you feel you're no longer gaining/improving, change things up. In the strength category there are other exersizes that target the same muscle, but at different angles etc, use different equipment (instead of a machine, use free weights (dumbbells / kettlebells) and vice versa to target all those little stabiliser muscles etc), the sky is the limit!
Be disciplined, be focussed, set realistic goals, and don't beat yourself up if you miss a session or you don't improve (fast enough). Depending on your starting position etc. you can't expect to run 5 K in two weeks time, you won't lift big weights. (expect at most about 10% increases in the weights you can lift every other week, with a 2-3 times per week frequency). And as far as that other issue of losing weight (check out my blog on that here: https://jkdmonologues.blogspot.com/2024/03/i-want-to-lose-weight.html) expect a healthy rate of about 1-2 pounds per week max! if you lose more, be careful, it won't be sustainable long term. Also don't forget that muscle mass is heavy, so you may not lose weight, but your gaining muscle and losing fat. So use a mirror, measuring tape, and notice a change in clothing sizes over time to judge your results!
There you go, enough to get on with. So get on with it!
Walk On!