How can we increase our rate of metabolism?

Following would be a few tried and proven methods to help increase your metabolism rates. 

1. Eat Plenty of Protein at Every Meal
   Hair and nails are mostly made of protein. Your body uses protein to build and repair tissues. You also use protein to make enzymes, hormones, and other body chemicals. Protein is an important building block of bones, muscles, cartilage, skin, and blood. So make sure you keep your protein consumption right, you can use the help of the Internet to calculate the exact amount of protein you need in your meals. 
    
2. Drink More Cold Water
   Drinking cold water has its benefits, cold water, during exercise can help keep your body from overheating and make your workout session more successful. This happens because cold water makes it easier for your body to maintain a lower core temperature. And as the benefits of drinking water go, it provides you with required hydration and energy levels for the day.
    
3. Do a High-Intensity Workout
   High-intensity workout or High-Intensity Interval Training has been around since the 1990s, this training regime is highly effective for burning fat. Some of the calories which are burned from high-intensity intervals come from a higher metabolism, which can last for hours after exercise. Overall, HIIT produces many of the same health benefits as other forms of exercise in a shorter amount of time.
    
4. Lift Heavy Things
   Heavy lifting is a strenuous exercise with many health benefits. It works not only the muscles involved in the lifting the weight but also works the cardiovascular system. So regularly lifting heavy things, assuming the lifting was done long enough and often enough, would provide a strong overall body workout, ultimately resulting in stronger muscles and a more efficient cardiovascular system.
    
5. Stand up More
   To avoid health risk you need at least 30 minutes of exercise every day. By standing at a stand-up desk part of the day it gives you the opportunity to do squats and calf lifts while you are working. Alternate between standing and sitting throughout the day would help you stay healthy, sitting for a certain time and standing up for the same amount of time later on.
    
6. Eat Spicy Foods
   Peppers contain capsaicin, a substance that can boost your metabolism. However, many people can't tolerate these spices at the doses required to have a significant effect. One study of capsaicin, at acceptable doses, predicted that eating peppers would burn around 10 additional calories per meal. Over 6.5 years, this could account for 0.5 Kg of weight loss for an average-weight male.

Hope I was able to provide you with the relevant information.