Soleus Pushup
The soleus pushup is a seated heel raise that works a deep calf muscle built for long, tireless effort. In the lab that devised it, the movement roughly halved the blood-sugar rise after a sugary drink, and a 10-person pilot found a smaller effect. It is free and promising, but preliminary.
Add it to your breaks from sitting, especially if standing or walking is hard for you, but don't use it in place of getting up and moving: it has not been shown to work as a substitute.
What it is
The soleus is a deep calf muscle built almost entirely for sustained, fatigue-resistant work. The soleus pushup isolates it: sitting with the front of your foot planted, you raise your heel, then let it down, and keep repeating.
Its discoverers report that working the soleus on its own can raise the muscle's energy use enough to shift metabolism across the whole body, even though the soleus is only about 1% of body mass.
What the studies found
The original lab study. After a glucose drink, sustained soleus contractions cut the rise in blood sugar by about 52% and the accompanying insulin surge by about 60%. Muscle samples showed the soleus used very little of its own stored sugar (glycogen), so it was running on sugar and fat drawn from the bloodstream.[1]
A small pilot. In 10 adults with prediabetes, doing the movement while seated during a glucose test gave about a 32% smaller rise in blood sugar.[2]
What hasn't been shown
The samples are small, and the key study comes from the lab that devised the technique. The "more effective than exercise" framing you may see is that lab's own, and no other group has yet replicated the result at scale.
Both studies measured blood sugar over a few hours. None has shown that the soleus pushup changes long-term health or how long people live.
Why it fits the sitting problem
Long sitting leaves the leg muscles idle for hours, and keeping those muscles working through the day is the point of breaking up sitting. The soleus pushup is one of the few ways to do that without standing up. Sitting covers the wider evidence, including leg fidgeting, a similar seated option.
What to do
- Use it as an extra, not a replacement. Getting up and moving remains the main habit.
- Try it if standing or walking is hard for you. It needs no equipment and is done sitting down.
- Expect a short-term blood-sugar benefit at most. Long-term effects are unknown.