The most frustrating thing is that this can make it tough to exercise, making it even tougher to shed unwanted pounds. "If your knees hurt, it's harder to lose weight through exercise,” sports medicine specialist Jordan Metzl, MD, tells WebMD. To avoid pain, Metzl recommends knee-friendly activities like riding a stationary bike. Brisk walking is also a good option.

2.    Running

That unforgettable runner’s high feels rewarding. However, running can cause something known as runner’s knee.

According to Runner’s World, patellofemoral pain syndrome (PFPS), also known as runner’s knee, affects many runners. This happens when the kneecap becomes irritated. Consequently, runners can experience either sharp or dull pain. This pain can be chronic or acute and may even go away during a run, but it tends to recur later.

Runner’s World says that runner’s knee is often a result of under-conditioned quadriceps and tight hamstrings. To avoid this injury, experts suggest adding strength training to your exercise routine to strengthen the quadriceps. Stretching also can help loosen tight hamstrings.  

Further, consider running on surfaces that put less stress on the knee. And don’t increase mileage too fast. Runner’s World suggests adding less than 10 percent distance per week.

Also, put some effort into finding that perfect pair of running shoes. Go to a specialized running store. These stores can fit you for shoes that reflect both foot type and gait. And if your knees do hurt, try not to run as far. This will put less stress on the knee, which will allow it to heal faster. Finally, engage in smaller strides when running uphill.