Exercise the quadriceps muscle with quad extensions. Learn about increasing leg strength in this training video. Take action: keep core tight, squeeze legs at top of movement, but only legs will move. Michelle, the instructor in this how-to video, is a personal trainer at a gym in NC and has been a personal trainer for several years. She is certified through ACE and is a certified aerobics instructor as well. Her Specialty is weight lifting and she enjoys training aspiring female body builders as she is one herself. She focuses on helping her clients stronger, healthier, and sending them out feeling better for it. The best part of her job is when she see people living a better life as a result of the physical training. She was also a Marine physical trainer before she was employed at the gym. Watch this video weight-lifting tutorial and learn how to do quad extension exercises.