First of all, check your workout gear, shoes and outfit adapted to indoor sports For this, ask a professional for assistance on what to get.
Also get a heart rate monitor so you can monitor your heart rate
Remember to stretch after each session; drink on a regular basis during the day.
Please respect instructions during your sessions, especially those pertaining to pace and heart rate.
From the start, control your breathing while inhaling and exhaling deeply from your abdomen and thorax.
Keep breathing comfortably, but also feel altogether comfortable.
Ideally, try to workout on Wednesday and Saturday or Sunday.
In order to reinforce your muscles, you can for example do the following exercise session once or twice a week; The exercises follow one another with very short recovery sequences (10 to 15 seconds).
You'll initially repeat 2 series of the following exercise (toning and stretching), and as you get more comfortable, add more series and/or add to your workout time.
1- Sitting, with your back to the wall: 45 seconds to 1 minute
2- Jump, feet parallel 90 ° flexion: 10 times
3- Abs, on your back, knees bent, hands behind your head, lift your chest towards your knees: 20 times
4- Flex your right leg, left leg behind, slightly bent and right foot on a chair: 10 to 20 times, then change legs
5- Jump right/left feet parallel (same as for a slalom): 6 times
6- Core strength exercise: lie face down on mat, rest on your elbows, forearms and toes, keep your back flat, in a straight line: 45 seconds to 1 minute
7- Stretching: 1 to 2 minutes to help you recover between laps.
Please do this session at the end of your workout; if its not possible,then do it on a different day. If that's the case, make sure to warm up before you get started.
GOOD LUCK.