<s>
C25K	B-Application
,	O
short	O
for	O
Couch	B-Application
to	I-Application
5K	I-Application
,	O
is	O
a	O
mobile	B-Application
app	I-Application
which	O
contains	O
training	O
plans	O
that	O
gradually	O
progress	O
toward	O
a	O
5	O
kilometre	O
(	O
3.1	O
mile	O
)	O
run	O
over	O
nine	O
weeks	O
.	O
</s>
<s>
The	O
app	O
,	O
created	O
by	O
Zen	O
Labs	O
,	O
is	O
based	O
on	O
the	O
Couch	B-Application
to	I-Application
5K	I-Application
running	O
plan	O
from	O
CoolRunning.com	O
.	O
</s>
<s>
It	O
is	O
one	O
of	O
the	O
highest-rated	O
health	O
and	O
fitness	B-Application
apps	I-Application
available	O
on	O
Android	B-Application
and	O
iOS	B-Application
.	O
</s>
<s>
The	O
NHS	O
in	O
the	O
UK	O
provides	O
downloadable	O
podcasts	O
and	O
a	O
smartphone	B-Application
app	I-Application
(	O
Android	B-Application
and	O
iOS	B-Application
)	O
for	O
the	O
plan	O
.	O
</s>
<s>
The	O
Couch	B-Application
to	I-Application
5K	I-Application
running	O
plan	O
was	O
created	O
by	O
Josh	O
Clark	O
in	O
1996	O
.	O
</s>
<s>
Clark	O
started	O
the	O
website	O
Kick	O
and	O
featured	O
C25K	B-Application
on	O
the	O
site	O
.	O
</s>
<s>
Clark	O
later	O
sold	O
his	O
stake	O
in	O
Cool	O
Running	O
and	O
the	O
Couch	B-Application
to	I-Application
5K	I-Application
program	O
.	O
</s>
<s>
As	O
of	O
2016	O
,	O
the	O
C25K	B-Application
app	O
has	O
been	O
used	O
by	O
over	O
5	O
million	O
people	O
.	O
</s>
