Cardio is very healthy.

I did not mean to derail, as I appreciate threads like these.

But of course if you practice bench press, you will get better at bench press... However transitioning from Calisthenics to a decent bench press would be quite easy.

I may be biased as a primarily Calisthenics guy, but I think being strong enough to do frontlevers, one arm pull ups, impossible dips, and full planches are as strong if not stronger than being able to cat V on that list.

Well, don't get me wrong. Those exercises you listed off definitely require a high degree of strength in stabilizing muscles. The planche for example requires you to hold your body in mid air, after doing a pushup, supported by your back, abs, glutes, and hamstrings. But ultimately the arms are only moving the same amount of weight, which is your bodyweight. Yes, your back, abs, glutes, and hamstrings would all have to be pretty strong to perform the balancing act, but strength in those muscles doesn't translate into a strong bench press.

The reason why people prefer heavy barbell work over Calisthenics is because heavy barbell work promotes growth in the fast twitch muscle fibers. Fast twitch muscle fibers grow quicker, from less work. They are also the "strong" muscle fibers, while slow twitch are the "endurance" muscle fibers. You can do 100 pushups and that isn't going to translate into a super strong bench press because you are recruiting, and training the weaker slow twitch fibers by doing that. Think of it as the Cheetah vs the Horse. In the same way that a horse will never be able to run at 60 MPH, the slow twitch fibers will never be able to generate enough pure force to put up better than an intermediate bench. And in the same way that a Cheetah is going to get gassed running for more than a little while, those fast twitch fibers also tend to get gassed easily. But not as easily as most people might think. When working at 1/3rd to 1/4th max capacity the fast twitch fibers can last a pretty long while, because not all of them are being recruited at once. So they kind of take turns like a relay race if you will. This is why people that can put up 100 pushups typically don't have the strength to bench at advanced levels, but people that can bench at advanced levels can still do 100 pushups.

But by all means if you want to give people advice on bodyweight exercises in this thread go for it. Anything is better than nothing.

I will be honest, I don't really like pushups, so I am not a strong advocate. If we are strictly talking bench press vs pushup, I mainly do bench presses. But.... the science says that both result in similar strength gains. Benchpress will make you better at benchpress of course, pushups will make you better at pushups, both will make you strong.

Sure if you want endurance, then you do 100 regular pushups at Bodyweight. But you have to remember pushups are a very complicated maneuver. You can add weight to pushups if you want, same as Bench Press. You can do 6-8 weighted pushups at max capacity just like Bench Press. You can do handstand pushups, you can do pike pushups, you can do one arm pushups, you can do archer pushups. You can change the lever of your body for a harder pushup. You can add rings to the fray.

People who can do 100 pushups can't bench at advanced levels typically, but people who can bench at an advanced levels can't do advanced pushups typically.

Thanks

I really wanted to start lifiting, I was REALLY underweight (56 kg, 184 cm) and now I'm starting to gain weight, but it's mostly fat and I have body dysmorphia, so my salient belly annoys the hell out of me and I start get paranoid and feel ugly and fat and it can trigger my anorexia to start again

But I don't know, I don't feel it's safe go to gymn yet. Yesterday my technical leader was hospitalized, he and his family tested positive for SARS-cov2. Numbers are only going up, it's not time yet

Well, if you add weight to pushups such as a weighted vest, then it's no longer a bodyweight exercise. The problem with doing pushup variations is that they are often harder because they work different muscles than a standard pushup. Handstand pushups work the shoulders instead of the chest. They are akin to a military press. Pike Pushups are more like an incline or decline bench than a standard bench. A one arm pushup is akin to doing a bench press with both hands in the dead center of the bar. Not a good position to put your wrists in, and it works your triceps almost exclusively. The wider your grip the more your chest is involved and the narrower your grip the more your triceps are involved. Rings are a great way to figure out how to get external shoulder rotation (bending the bar cue) but don't add more weight to the exercise. Archer pushups are like a pec fly, which is great, but definitely not something to make the main focus of your chest routine.

This is why people that can bench can't do advanced pushups. Advanced pushups work different muscles than the bench press.

I gotta get going to work, but I'll link to some scientific articles that show that low rep, high weight results in greater strength gains, compared to high rep low weight.

123 lbs/56 kg? At 6 Feet tall? Damn that's light. Use this calculator to figure out how much you need to eat. https://legionathletics.com/macronutrient-calculator/ IMO just start off with bodyweight exercises, since you are afraid to hit the gym due to Covid. You're so underweight that building muscle should be easy, bodyweight exercises or not.

I already know low rep, high weight gets greater strength results hence the weighted push ups. You were comparing bodyweight push ups vs Bench Press, but I wanted to give more options for building strength over endurance. Calisthenics can use weights too.

I was suffering from clinical malnutrition, I started a new diet in August (with the help of a nutritionist). She also forbid me from making physical activity, because I could not spare any calories while so underweight 

I'm 63kg now which means I'm out of the malnutrition zone and just "healthy underweight" I guess... 

But my last bioimpedance indicate I'm at 12% body fat (I was 8% when I was 56 kg), my lean mass that I got only from food is starting to degrade as well, so she prescribed Whey Protein. She wants me to do weight train, but I just cant feel safe lifting in a gymn 

I might just do home bodyweight exercise  for at least some months. I want 66-67 kg, but without move my body fat percentage 

Yeah, Rogue sells some pretty good vest plates. Bodyweight with a weight vest would actually work out really well. If you want to give IcaroRibeiro some bodyweight stuff to do that would be fantastic. :)

What kind of Whey Protein are you using? Bodyweight exercises would be fine for you. Get at least 1 gram of protein per lb that you weigh (138 grams) every day. After that get the rest of your calories from 20% fat, and 40% carbs. Try to aim for a calorie surplus of 5% to 10%, and workout at least three days a week. Here's a decent bodyweight program to get on. https://legionathletics.com/the-ultimate-bodyweight-workout-routine/#the-best-bodyweight-workout-routine-for-men