It's unlikely you can visibly enhance hand veins in just 5 minutes, but specific hand exercises may temporarily make them more prominent.
According to the YouTube video "How To Get Veiny Hands (Full Guide)," you can try the following to potentially make your hand veins more visible, though the 5-minute timeframe is ambitious:
- Hand Curls: Do 50 repetitions of hand curls, squeezing your hand very hard. The video (5:19) claims you'll start to see your veins.
- Finger Extensions: Following the hand curls, perform 50 finger extensions (8:19).
Keep in mind that the visibility of veins is also affected by factors like body fat percentage, hydration levels, genetics, and skin tone.