Weight input on Train Fitness is a manual process. For any exercise, Train Fitness remembers the weight you used last time and uses that historical value when you do the exercise next time.

Exercises marked with "x2" are performed with a weight on each side of the body, such as Bicep Curls. Log the weight of a single side when doing an "x2" exercise.

For example, if you are performing Bicep Curls with 20 lbs dumbbells in each hand, you would log 20 lbs, as bicep curls are denoted with "x2" in the weight field.
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For barbell exercises, log the total weight you are lifting, including the bar and all the plates.

For example, if you are lifting 20 lbs on each side of a 45 lbs barbell, you would log it as 20 + 20 + 45, or 85 lbs.
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There are several variations when it comes to barbell weight. These are the most common types of barbells you will see in the gym.

If you do an exercise with no external weight, such as bodyweight lunges or bodyweight push-ups, log it as "BW" (Bodyweight).
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For exercises involving equipment that are neither barbell exercises nor marked as x2, log the weight as displayed on the equipment.