how to set an objective in daily suggested workout?

Hello Camilo, 

Unfortunately there is not a way to set a manual goal for your Daily Suggested workouts. These will update according to your fitness metrics you achieve.

Top FAQs About Daily Suggested Workouts

When using the Auto Detection feature on your Garmin device, Daily Suggested Workouts will use your lactate threshold and functional threshold power to fine tune workout intensity targets. If you prefer to manually adjust these values in your user profile you can do so, however manual adjustments will not be factored into the DSW intensity targets. For best results, enable auto detection and ensure your max heart rate is set correctly in your user profile. Having your heart rate set correctly will help ensure your automatically detected lactate threshold or FTP matches your own physiology and current performance abilities.