Jason Karp

PHOENIX, AZ (November 17, 2022) – The International Sports Sciences Association (ISSA), the global leader in personal training certification, announced the acquisition of REVO₂LUTION RUNNING to educate coaches and fitness professionals and give runners access to certified running coaches who can improve performance and prevent injuries. By purchasing the program and its assets, ISSA becomes …

INTERNATIONAL SPORTS SCIENCES ASSOCIATION ACQUIRES REVO₂LUTION RUNNING TO BRING RUNNING COACHES TO EVERYONE Read More »

Running a marathon as fast as you can takes a long time to recover from, more than people realize, in large part because it causes a lot of muscle fiber damage. Even after 4 weeks after a marathon, damage is still present. My guidelines for how to recover and return to running after a marathon. …

Marathon Recovery Read More »

Many endurance sports nutritionists claim that runners should spare their limited store of carbohydrate by trying to rely on fat for as long as possible, and possibly by becoming “fat adapted.” However, marathon runners can actually run faster by relying on carbohydrate for as long as possible in the race. As was first discovered more …

Marathon Nutrition Read More »

Ever been told that running in the heat is like running at altitude? Haha. It’s not. The reason why you run slower at altitude is because of less oxygen delivery to skeletal muscles because of the lower partial pressure of oxygen in the air. The reason why you run slower in the heat is because …

Altitude Training vs. Heat Training Read More »

I once dated a girl who had a thing for my calf muscles. Seriously. Calf muscles. She may have been on to something. Did you know that the energy cost of calf muscle contraction in highly trained runners is nearly 25% of the total metabolic cost of running? In recreational runners, it’s 40%. That’s a …

Calf Muscles Read More »

SAN DIEGO, CA – REVO₂LUTION RUNNING, the leading running certification program for coaches and fitness professionals, today announced its partnership with the International Sports Sciences Association (ISSA), the world leader in fitness education and certification. With this partnership, ISSA owns a minor stake in the company and adds to its impressive product line, offering the …

REVO₂LUTION RUNNING™ ANNOUNCES PARTNERSHIP WITH INTERNATIONAL SPORTS SCIENCES ASSOCIATION Read More »

I went to Tambach track overlooking the Great Rift Valley in Kenya to do VO₂max intervals at 6,400 feet. Since the Kenyan athletes don’t typically do intervals on Mondays, it was nice to have the track all to myself. The defining characteristic of altitude is a lower barometric pressure, which keeps decreasing the higher up …

Sea-Level Speed Workouts Read More »

Speed-type distance runners, who have a generous amount of fast-twitch A muscle fibers, may benefit more from a high volume of interval training to improve endurance compared to endurance-type runners. Running many weekly miles at a low intensity doesn’t do as much for speed-type runners. Endurance-type distance runners, on the other hand, get a lot …

SPEED-TYPE AND ENDURANCE-TYPE RUNNERS Read More »

Today marks 9 weeks of living in Kenya. Here’s what I know for sure: 1. When you hang dry cotton T-shirts and underwear after washing them, they dry stiff, as if they have been starched. I miss fabric softener.   2. There is a lack of scientific and individualized training in Kenya, which makes the …

9 Things I Know After Living in Kenya for 9 Weeks Read More »

Running technique has a lot to do with the angles at which the runner’s legs and feet strike and push off the ground. When your foot lands on and pushes off the ground, it applies a force to the ground. As Isaac Newton taught you in high school physics class, for every action there is …

Running Angles Read More »