Weightlifting
Running
Cycling
Swimming
High-intensity workouts
Sports
Physically demanding work
People who exercise regularly may notice that their hands and forearms look particularly vascular immediately after training.
If you lift weights, for example, you may notice veins appearing much more clearly while gripping a barbell or performing strenuous repetitions.
This doesn’t necessarily mean anything is wrong.
As your body returns to its resting state, the veins often become less prominent.
Study Anatomy
The same person can therefore have relatively subtle veins in the morning and much more visible veins after an intense workout.
