Tập hít xà đơn. Chèo tạ đơn để tập cho lưng và cánh tay. Ngồi cúi người dang tạ đơn. Chọn 2 hay 3 bài tập để bổ sung vào buổi tập.

Given the above summary, write a detailed text in English for it.
Grip the chin-up bar with your palms facing out and your arms slightly closer than shoulder-width apart. Your arms should be fully extended above you, and your torso should be as straight as possible. Exhale as you pull your body up until your head is level with the bar. Hold this position with your biceps slightly squeezed, and then exhale as you lower yourself slowly back to your starting position.  If you don’t have the strength to do this on your own, ask a spotter to support you by holding your legs. Repeat this for 5 sets of 2 to 3 reps. Rest your right knee on a workout bench and bend at the waist until your upper body is parallel to the floor, then place your right hand on the bench. Use your left hand to pick up a dumbbell from the floor and hold it with your palm facing your torso, your arm extended, and your back straight. Exhale as you slowly lift the dumbbell, bending your arm at the elbow and keeping your upper arm near your torso. Squeeze the back muscles when the dumbbell reaches your chest. Inhale as you lower the dumbbell back to the floor. Repeat the move for 3 set of 8 to 10 reps on each side of your body. Sit on the edge of a workout bench with your legs together and two dumbbells placed slightly behind your legs. Bend at the waist, keeping your back straight and your palms facing each other, and reach for the dumbbells. Keep your arms bent slightly at the elbows and exhale as you lift the dumbbells out to the side until your arms are parallel to the floor. Hold the dumbbells in position for 1 second and then lower them slowly while inhaling. Repeat this for 3 sets of 6 to 8 reps. To really get definition in your back and melt away fat, you'll want to diversify how you work out that area. Incorporating 2 or 3 of these exercise on back day can help you do that.