If you are conscious of your joint health but still want to work up a sweat then take a few minutes to consider the most effective low impact exercises that will help you to shed a few extra pounds ahead of the summer beach season.    Walking Walking is the perfect low impact activity that can be managed by most people, it is perfect for people of all fitness levels and the best thing is it is free! This popular exercise can be very effective if done regularly and can be enhanced by increasing your speed and carrying extra weights for an additional challenge. Interval training is a power tool for trimming down…