I play the guitar, and recently I've been having trouble playing bar chords...?

Question:

I play the guitar, and recently I've been having trouble playing bar chords...?

I've heard that there are various finger strengthening devices/ exercises one can do. Any ideas? Strengthening devices you would suggest? Thank you for your time!

Best Answer - Chosen by Asker: pump a hand spring if you want to act pro......but basically the old law of 10hrs practice a day for a year or two will get you there......then get the hand spring.