Try Angle jelqs.
When I'm faced with unintentionally serious wood during a workout, I'll switch to those exercises that require 80 plus percent erection level. I'm sure the reason for achieving these high levels isn't strictly for fun, right, DLD?
Erection during workouts also provides a great opportunity to work on edging or multiple orgasm techniques. Use the event to learn to approach your moment of failure (ejaculation) without shooting. For those skills, often the bigger and harder, the better.
It seems to me that this is a good state for girth gain: what other purpose is there to raise your erection level for certain exercises?
You can also really feel kegels in this state and observe your PC contraction strength.
Another thing: whip out the ruler. Best BPenis EnlargementL and EG numbers.
Of course, jelqing to ejaculation can be supersweet. I posted about this at another forum but I'll testify again: allowing a big blow during a workout is major. It shouldn't be considered a detriment.
That said, anyone who uses NPenis Enlargement for strictly masturbatory purposes will eventually lose interest and won't be posting any gains.