Rather than watching endless hours of mindless TV, sometimes it's good to pick up a project. But starting a new hobby can sometimes require a little instruction. Fortunately, throughout Hudson County, there are lessons for just about anything. The Hoboken YMCA offers its members classes in everything from aqua-aerobics to kick boxing to dance to yoga. Once a month throughout the spring and summer, the Y will also offer relaxation and rejuvenation workshops to both members and non-members. The R&R workshop is like yoga, but even more relaxing, said Trish McQuillen, who is in charge of marketing for the Y. "During our power yoga classes, you really get a workout," said McQuillen. "In the workshop, you get into relaxed poses and surround your body with pillows and cushions. The lights are out, the candles are lit and new age music is playing in the background. The instructor, who is certified from the Yoga Zone in New York, has a soothing and calm voice. It's like watching golf on Sunday afternoon. She has a peaceful way of speaking that takes you to a place that's not Hoboken and 14th Street." The workshop costs $10 a session for members and $20 for non-members. A one-year Y membership costs $411 a year. For more information call 963-4100. Those interested in flexing their artistic muscles should visit A Time to Kiln, 938 Washington St., in Hoboken. The pottery/painting center offers mosaic instructions on Tuesday nights and clay classes on Wednesday nights from 7 to 9 p.m. The cost of each class depends upon the amount of materials used. Last, but certainly not least, there is the Guitar Bar located at 160 First St. in Hoboken. Not only can the musically inclined, or the musically disinclined who want to become inclined, buy or rent music equipment, but the Bar also offers lessons in everything from piano to guitar to drums to vocals to the saxophone. Lessons cost $20 for a half an hour and are scheduled by appointment. And you don't have to be a kid to learn an instrument. Andy Burton has been teaching piano at the Bar for over three years. "I have students of all ages," said Burton. "They range from 5 to 40."