Squats are the best exercise for gaining weight because they help you build muscle around your leg and butt areas.
Push-Ups
Get on the floor and slowly push your body towards the floor until your chest nearly touches the ground.
Bench Dips
For this exercise, you need a Bench. To do it, grip the ends of the bench with your palms facing downwards and extend your legs forward.
Lunges
Stand up straight, step forward with one foot, and lower your body until your thigh is parallel to the ground.
Crunches
Doing this exercise can give you a perfect midsection. Crunches target all the abdominal muscles but they primarily work the abdominal muscle and the obliques.
Glute Kickback
Glute kickbacks work your gluteal muscles, hamstrings, and lower back. They are a good exercise to gain body weight.
Pull-Ups
Pull-up is a high-resistance exercise that builds more muscles. More muscles mean more bodyweight.
Bench Press
Bench presses are great for bulking up. This exercise helps in building shoulders, chest muscles, and triceps. Doing Bench press will help to gain weight.
Deadlift
Deadlifts are great for increasing muscle mass and strengthening the upper back, low back, hamstrings, and glutes.
Burpees
Stand with your feet shoulder-width apart, squat down, place your hands on the floor, kick your legs out behind you, and lower your chest to the floor.