Exercise keeps the body in good shape and puts the mind in sound state. Some advocate participating in group sports while others give priority to individual activities. I side with the latter view.
To begin with, to exercise alone is more convenient. Just think about how much time would be saved from preparing and organizing. When people engage in sports with family and friends, they have to agree upon a date and time available for all the participants, as well as a place to meet up. If you just happen to get caught in work and you have just had a bad day, then you will have to reschedule. That would put you in a tough spot because people have to meet halfway in order to make it work for you. As a result, you would end up calling your friends to apologize for causing inconvenience and having to bail on them. On the contrary, if you give it s shot to fly solo, you would spare all the trouble and have it all on your own terms. It won’t take more than a free afternoon and some dumbbells to practice weightlifting by yourself. You can increase the weight if you feel up to it or put if off to the next day when you are not in the mood for sports. Therefore, you can adjust according to your own preference without any trouble and guilt.
Second, to exercise alone makes it easier to concentrate on sports itself. Sports activities are supposed to provide a temporary escape for the hustle and bustle of the modern life, but the truth is, group activities have turn sports into a new form of networking and socializing. Businessmen who go on a golf trip are not playing it for leisure and pleasure, but rather they are working on business deals and rubbing elbows with potential clients. This group activity serves them well because it offers a chance to bound through the club-swinging and hole in one. For such engagement, anxiety will build up quite soon while sports is just beside the point. However, individual activities like yoga and meditation take your mind off your work and life; soothing music and the focus on body and mind creates an outlet for stress. Quite similarly, jogging and marathon help foster persistence and endurance, because by spending time with yourself, an individual opens up a dialogue with the inner self and puts weight back to the essence of sports per se.
To sum up, compared with group sports, to exercise alone is more preferable. 
 Exercise
  keeps
 the body in  
good
 shape and  
puts
 the mind in sound state.  
Some
 advocate participating in  
group
  sports
 while others give priority to individual  
activities
. I side with the latter view.
To  
begin
 with, to  
exercise
 alone is more convenient.  
Just
  think
 about how much time would  
be saved
 from preparing and organizing. When  
people
 engage in  
sports
 with family and friends, they  
have to
  agree
 upon a date and time available for all the participants,  
as well
 as a place to  
meet
 up. If you  
just
 happen to  
get
 caught in work and you have  
just
 had a  
bad
 day, then you will  
have to
 reschedule. That would  
put
 you in a tough spot  
because
  people
  have to
  meet
 halfway in order to  
make
 it work for you.  
As a result
, you would  
end
 up calling your friends to apologize for causing inconvenience and having to bail on them.  
On the contrary
, if you give it s shot to  
fly
 solo, you would spare all the trouble and have it all on your  
own
 terms. It won’t take more than a free afternoon and  
some
 dumbbells to practice weightlifting by yourself. You can increase the weight if you feel up to it or  
put
 if off to the  
next
 day when you are not in the mood for  
sports
.  
Therefore
, you can adjust according to your  
own
 preference without any trouble and guilt.
Second, to  
exercise
 alone  
makes
 it easier to concentrate on  
sports
 itself.  
Sports
  activities
  are supposed
 to provide a temporary escape for the hustle and bustle of the modern life,  
but
 the truth is,  
group
  activities
 have turn  
sports
 into a new form of networking and socializing. Businessmen who go on a golf trip are not playing it for leisure and pleasure,  
but
  rather
 they are working on business deals and rubbing elbows with potential clients. This  
group
  activity
 serves them well  
because
 it offers a chance to bound through the club-swinging and hole in one. For such engagement, anxiety will build up quite  
soon
 while  
sports
 is  
just
 beside the point.  
However
, individual  
activities
 like yoga and meditation take your mind off your work and life; soothing music and the focus on body and mind creates an outlet for  
stress
. Quite  
similarly
, jogging and marathon  
help
 foster persistence and endurance,  
because
 by spending time with yourself, an individual opens up a dialogue with the inner self and  
puts
 weight back to the essence of  
sports
 per se.
To sum up, compared with  
group
  sports
, to  
exercise
 alone is more preferable.