Can beginner add extender after JP90?

[I_just.wanna/get:bigger]

2 hours right after JP90 warmdown or in the morning dont know yet
+30 min every week

[BigO]

You can but you risk overtraining.

If you decide to do it, you won't know where your gains are coming from and if you overstrain, you may not get gains at all.

On the other hand, you may gain well.

How far into the JP 90 are you?

[I_just.wanna/get:bigger]

first day yesterday but it couldnt get to 70% erection after first set of wet and v jelqs, I got scared and stopped, warmed down

[I_just.wanna/get:bigger]

My goal is 2 inches length and 0.5 girth so maybe I should just stop with JP90 and go with extender until I get first inch or so

[BigO]

My goal is 2 inches length and 0.5 girth so maybe I should just stop with JP90 and go with extender until I get first inch or so

Its up to you, either is safe. The JP routine as with any routine will take a bit of getting used to.

Consistency is the key.