How would I exercise every muscle without the gym? - Please some advice.

[Farsided]

To quote Rebellion CEO, Medieval guy extraordinaire Jason Kingsley : 'Shoveling shit will get you fit'

So grab a shovel and set sail to Hindustan my brother.

 

[Aiōn]

You could find some online workouts to do, there are plenty of free ones that you can download. All you would need is some dumbbells in various weights and maybe a resistance band for the pilates ones.

Fitnessblender is a couple who used to be trainers and have uploaded 1000+ of free workout videos to follow along to, they're on YouTube and also have their own website. Leslie Sansone's walk at home workouts are good for rest day, right after a meal or as a warm up. Jillian Michaels has several workout series like the 30 day shred, you could probably find most of those online or pick them up very cheaply on DVD by now.

Edit: Exercises that require maintaining balance are particularly effective for engaging various muscles imo, you could also consider getting a weighted vest.

Good luck!

 

[FinnSven]

If you have space, just a basketball and a hoop can do wonders.

Run around in circles and dribble the ball, and incorporate some throws and dunks in the hoop.
This will mean you use all of your important muscles and will be doing some things which come in handy like running and jumping so you can run for a bus or jump over a surprise obstacle without risking a heart attack.

Mix it up a bit with things like doing burpees and then shoot a hoop and if you want to build strength, get a medicine ball too.

Personally I do ten three minute rounds on a heavy bag or speed ball daily.
I hated ball sports as a kid and preferred swimming and getting into fights.
So boxing was a better progression for me.

 

[Dr. Addidas]

Burpees, just do burpees for 1 hour 3 times a day and eat fuckloads of rice, chicken and broccoli, that's all I did in rehab and I went from skinny twig to bulk fuck in a month lol

 

[Hey Johnny Bravo]

Swimming. Go swimming.

 

[Paradox Mystic]

You need to remember it isn't just about working out, you need to get some stretching in and maintain a good diet. Pushups, situps, burpies ect are great, but I'd recommend trying to find something for weightlifting to really build muscle. After a certain point, basic exercises is about maintaining what you have, and not increasing significantly.

 

[Idiotron]

Do this.
Best single exercise for your upper body I've ever tried.
2 months of this just like 10 minutes per day and you will see real differences.

 

[souschef]

You can't "define" fat, your muscles are under it. First you need a calorie deficit for your muscles to show

 

[Sultan Bin Jewstar]

I am getting fatter and would like to fix that

Parroting everyone else here- start addressing this first with diet if you are sedentary. Your joints will thank you.

If I was to only do sit ups, pushups, squats, planks and wall sits, are there any key muscles that I would be neglecting?

Chiefly your back, glutes, and forearms. Depending on your form, there are tons of accessory muscles that get lost in the sauce.

What bodyweight exercises would you recommend to target those areas?

Stretching, lunges, burpees, and pull ups.

Fat == sedentary == not limber
Not limber == some variations of exercises will feel prohibitive because you feel like you can't do them.
Eg- you'll want to keel forward while squatting. This splits load between your lumbar and quads instead of glutes and quads.
Chest high and back straight during a squat will move the load from your lumbar to your glutes.

Lunge variations are free and they make all of the difference in terms of muscle groups targeted, but there are brain games here. Try doing 5 lunges by stepping forward. Now contrast that with how it feels to do 5 by stepping backward. Contrast that with a split lunge/Bulgarian split squat.

Burpees are great all the way around. You'll look and feel retarded, but they'll work just about everything and get your HR higher faster than just about anything without equipment short of sprinting.

Pull ups are a slog if you're fat and they don't fit your question, but they're worth bending your rules once you're at a good weight to do them. If you decide to move to doing bar work, you will appreciate having grip strength.

How should I plan out my sets of these exercises? Should I do the same routine every day?

There are a few schools of thought on rep and set schemes. None are magical. 7 reps won't turn on your balls to make more testosterone. Just go until you feel like you've got two left, stop, and then do that again until you can't.
If you don't want something like that, you can do something like:
Pick a period of work (30 seconds or something)
Do the exercise and do not stop for that period
Rest for half of that
Repeat

There's supposedly science behind the work, rest for half the work period, and repeat thing. It's called Tabata and usually goes (20/10)×8, but I'm not going to do a Tabata sperg.

the most important thing is that you find something you enjoy doing

This is important.

Burpees, just do burpees

Can't go wrong so long as you don't hurt yourself.