Will receive diaphragmatic breathing with pursed lips as (breathing exercise), They will instruct to perform 3 different conditions will be registered: (1) 6 min of quiet breathing (3 sets of 2 min each), defined as spontaneous breathing pattern; (2) 6 min of diaphragmatic breathing (3 sets of 2 min each); and (3) 6 min of diaphragmatic breathing plus pursed-lips breathing (3 sets of 2 min each).

For aerobic exercises: Will include the following exercises: walking, cycling, running and intermittent running. The exercises will perform for 18-60 minutes for 1-2 sets per week.

For resistance exercises: Will include the following 8 exercises: shoulder press, biceps curl, triceps curl, bench press, leg squats, leg press, leg curl and toe raise. The exercises will perform for 60 minutes for 2-3 sets per week.

not receiving any exercises

6 min of quiet breathing (3 sets of 2 min each), 6 min of diaphragmatic breathing (3 sets of 2 min each), 6 min of diaphragmatic breathing plus pursed-lips breathing (3 sets of 2 min each).

assessed using the Short Form-36 (SF-36). The SF-36 scale had 8 dimensions, and each dimension was converted into a percentage score.

assessed using the Short Form-36 (SF-36). The SF-36 scale had 8 dimensions, and each dimension was converted into a percentage score.

assessed by a spirometer. The following parameters related to respiratory function will be measured: (1) forced expiratory volume in 1 second (FEV1); (2) forced vital capacity (FVC).

assessed by a spirometer. The following parameters related to respiratory function will be measured: (1) forced expiratory volume in 1 second (FEV1); (2) forced vital capacity (FVC).

measured with a tape measure at 2 different levels of the rib cage. Measurements will be taken at the maximal inspiration and expiration