Questions about weight and reps

[cdp11]

What should i do if with one weight, i can do 15 or more but with the next weight up, i cant really do 8 with good form. This mostly has to do with dumbbells. The other day i was doing bicep curls (concentration curls) and i could do more than 15 with 15lbs but when i went up to a 20 lb dumbbell, I could only do 8 and even then my form wasnt all that great for the last couple of reps

 

[The Shadow]

Slow down the reps on the 15 pounders(6 seconds each) and go till failure....if you get 6-10 reps keep the weight the same.

 

[cdp11]

Thanks a lot. So if I can get 6 reps with 20 pounds should i do that or just go for the higher, slower reps of 15?

Slow down the reps on the 15 pounders(6 seconds each) and go till failure....if you get 6-10 reps keep the weight the same.

 

[The Shadow]

If you can get 6 with the 20's on a 6 second rep:

DO two sets with the 15s
one ste with the 20's

 

[cdp11]

Awesome...thanks so much for the advice!!

If you can get 6 with the 20's on a 6 second rep:

DO two sets with the 15s
one ste with the 20's