(Image credit: Shutterstock) Strength training is essential as we get older, as it can help slow down and reverse the loss of muscle mass that naturally occurs after the age of 60. Yet if you’re a beginner, or you’re returning to fitness following an extended break, it can be tricky to know where to start. For your daily dose of inspiration, we’ve turned to personal trainer Janet Osbourne , who shares a simple workout that works your entire body. All you’ll need for the workout is a set of dumbbells. You can check out the best adjustable dumbbells for working out at home here, but if you don’t have any to hand, use two heavy books or milk cartons. Remember to start with a light weight and build up — the right weight will feel challenging, but not impossible, by the final few reps. If you’re currently dealing with an injury of any kind, it’s always best to seek personalised advice from a qualified professional. What is the workout? For the workout, you’ll do six different exercises in total.…