For the past three years, our friends and colleagues have been shrinking all around us. You probably know someone who is 'on the pen': an estimated 1.6million people in the UK are now using them.

Oprah Winfrey decided she'd master this strength training move two years ago, and today she did it. Winfrey shared the video of her achievement online.

I’ve found that just 15 minutes of strength training can help boost my energy, and contribute toward improving my fitness levels and building muscle mass when done consistently. This kind of efficient ...